PDS_VERSION_ID      = PDS3
RECORD_TYPE         = STREAM
SPACECRAFT_NAME     = "MARS GLOBAL SURVEYOR"
TARGET_NAME         = "MARS"
OBJECT              = TEXT
 INTERCHANGE_FORMAT = ASCII
 PUBLICATION_DATE   = 2003-10-01
 NOTE = "errata for MOC SDP volumes"
END_OBJECT          = TEXT
END

MGSC_1236:

Ancillary data for narrow angle image E2000526 were calculated without 
SPICE C-kernel information because C-kernel data were unavailable for 
part of the image.  MGS was assumed to be pointed at the targeted ROTO
image location although in fact MGS was slewing during acquisition 
of E2000526, so it did not hit the target.

MGSC_1233:

The discontinuity in image numbering from E1800504 to E1849152 and 
likewise from E1849302 to E1800551, is due to the MOC's internal 
sequencing software acquiring images autonomously following an uplink 
command failure.  Such images are assigned an ID starting with 49152 
to distinguish them from explicitly commanded images.

MGSC_1226:

Ancillary data for wide angle images from E1500225 to E1500276 were 
calculated without SPICE C-kernel information because C-kernel data 
were unavailable for part of the image; the lack of this data caused 
erroneous ancillary data to be computed.  MGS was assumed to be
nadir-pointed for images from E1500225 to E1500276; these images
were acquired while MGS was in nadir (not Relay-16) attitude.

MGSC_1223:

Ancillary data for wide angle images E1400222 and E1400223 were 
calculated without SPICE C-kernel information because C-kernel data 
were unavailable for part of the image; the lack of this data caused 
erroneous ancillary data to be computed.  MGS was assumed to be
nadir-pointed for images E1400222 and E1400223; these images
were acquired while MGS was in nadir (not Relay-16) attitude.

MGSC_1176:

Ancillary data for wide angle images E0901600 and E0901601 were 
calculated without SPICE C-kernel information because C-kernel data 
were unavailable for part of the image; the lack of this data caused 
erroneous ancillary data to be computed.  MGS was assumed to be
nadir-pointed for images E0901600 and E0901601; these images
were acquired while MGS was in nadir (not Relay-16) attitude.

MGSC_1167:

Ancillary data for wide angle images E0800570 and E0800571 were 
calculated without SPICE C-kernel information because C-kernel data 
were unavailable for part of the image; the lack of this data caused 
erroneous ancillary data to be computed.  MGS was assumed to be
nadir-pointed for images E0800570 and E0800571; these images
were acquired while MGS was in nadir (not Relay-16) attitude.

MGSC_1149:

Ancillary data for narrow angle image E0502961 were calculated without 
SPICE C-kernel information because C-kernel data were unavailable for 
part of the image; the lack of this data caused erroneous ancillary data 
to be computed.  MGS was assumed to be nadir-pointed for image E0502961.

MGSC_1118 and MGSC_1119:

The MOC narrow angle and wide angle focal plane temperature sensors 
erroneously reported constant values of 255.3 and 230.6, respectively,
for images from M2201352 to M2201572, and 255.2 and 230.6, respectively,
for images from M2201988 to M2202210.  The focal plane temperatures 
listed for these images on MGSC_1118 and MGSC_1119 were calculated
from spacecraft engineering temperature data for that time period.  
The majority of these estimates are judged to be correct to +/- 1 
and 2 degrees for the narrow angle and wide angle, respectively; a 
few estimates could be as much as 3 degrees off.

MGSC_1110:

This volume also contains the following images from previous volumes:

Images M0700789 and M1202598 were found to be better in the realtime 
operations version than from the JPL level 0 CD source.  These versions 
are included on MGSC_1110.  Their parameters appear at the end of the 
imgindex.tab and cumindex.tab files on the same volume.

MGSC_1099:

Ancillary data for context images M1300225 and M1300823 were calculated 
without SPICE C-kernel information because C-kernel data were unavailable
for part of the image; the lack of this data caused erroneous ancillary 
data to be computed.  MGS was assumed to be nadir-pointed for images 
M1300225 and M1300823.

MGSC_1098:

This volume also contains the following images from previous volumes:

Images M0201013, M0804457, and M0903608 were found to be better in the
realtime operations version than from the JPL level 0 CD source.  These
versions are included on MGSC_1098.  Their parameters appear at the
end of the imgindex.tab and cumindex.tab files on the same volume.

MGSC_1064:

Ancillary data for narrow angle image M0803208 were calculated without 
SPICE C-kernel information because C-kernel data were unavailable for 
part of the image; the lack of this data caused erroneous ancillary data 
to be computed.  MGS was assumed to be nadir-pointed for image M0803208.

MGSC_1057 and MGSC_1058:

The MOC narrow angle and wide angle focal plane temperature sensors 
erroneously reported constant values of 268.9 and 243.0, respectively,
for images from M0705439 to M0706057.  The focal plane temperatures 
listed for these images on MGSC_1057 and MGSC_1058 were calculated
from spacecraft engineering temperature data for that time period.  
The majority of these estimates are judged to be correct to +/- 1 
and 2 degrees for the narrow angle and wide angle, respectively; a 
few estimates could be as much as 3 degrees off.

MGSC_1048:

The discontinuity in image numbering from M0403839 to M0449182 and 
likewise from M0449232 to M0403861, is due to the MOC's internal 
sequencing software acquiring images autonomously following an uplink 
command failure.  Such images are assigned an ID larger than 49152 
to distinguish them from explicitly commanded images.

MGSC_0008:

The cumindx.tab entry for image SP243306 on MGSC_0008 is incorrect.  The
parameters in that entry actually correspond to image SP244306; a corrected
version is included on MGSC_0010.

The first cumindx.tab entry for image SP245503 on MGSC_0008 is incorrect.
The parameters in that entry actually correspond to image SP244503; a 
corrected version is included on MGSC_0010.

General:

As a point of clarification, if an image is to be flipped left-right
because its USAGE_NOTE has a value of 'F', it may still have to be
rotated into a north-up orientation as indicated by the NORTH_AZIMUTH
parameter.  That is, a roughly north-up orientation may still require
a rotation of 180 degrees after flipping.


The MOC team has identified that the data for the following images
were of better quality in the realtime operations data retrievals
than were recorded on the Level 0 Science and Engineering CD-ROMs:
        FHA00908.IMQ
        M0000134.IMQ
        M0000165.IMQ
        M0000503.IMQ
        M0000817.IMQ
        M0001369.IMQ
        M0001612.IMQ
        M0001691.IMQ
        M0001715.IMQ
        M0001737.IMQ
        M0001864.IMQ
        M0002049.IMQ
        M0002357.IMQ
        M0002488.IMQ
        M0002489.IMQ
        M0002492.IMQ
        M0101866.IMQ
        M0103043.IMQ
        M0201013.IMQ
        M0202137.IMQ
        M0303659.IMQ
        M0304020.IMQ
        M0304184.IMQ
        M0304618.IMQ
        M0304622.IMQ
        M0305849.IMQ
        M0306075.IMQ
        M0400281.IMQ
        M0400824.IMQ
        M0400958.IMQ
        M0401313.IMQ
        M0401975.IMQ
        M0402242.IMQ
        M0402807.IMQ
        M0700789.IMQ
        M0700819.IMQ
        M0701411.IMQ
        M0706090.IMQ
        M0803444.IMQ
        M0803981.IMQ
        M0804078.IMQ
        M0804192.IMQ
        M0804223.IMQ
        M0804319.IMQ
        M0804387.IMQ
        M0804452.IMQ
        M0804457.IMQ
        M0805126.IMQ
        M0805127.IMQ
        M0805128.IMQ
        M0805129.IMQ
        M0805350.IMQ
        M0806411.IMQ
        M0806516.IMQ
        M0808073.IMQ
        M0901048.IMQ
        M0901534.IMQ
        M0901650.IMQ
        M0902716.IMQ
        M0902971.IMQ
        M0903556.IMQ
        M0903608.IMQ
        M0904231.IMQ
        M0904975.IMQ
        M0905715.IMQ
        M1000237.IMQ
        M1000405.IMQ
        M1000849.IMQ
        M1001377.IMQ
        M1001710.IMQ
        M1002289.IMQ
        M1002309.IMQ
        M1002317.IMQ
        M1002830.IMQ
        M1003164.IMQ
        M1003482.IMQ
        M1003592.IMQ
        M1100144.IMQ
        M1100147.IMQ
        M1101325.IMQ
        M1101961.IMQ
        M1102275.IMQ
        M1102360.IMQ
        M1104298.IMQ
        M1104327.IMQ
        M1200090.IMQ
        M1201787.IMQ
        M1202303.IMQ
        M1202320.IMQ
        M1202598.IMQ
        M1202618.IMQ
        M1202696.IMQ
        M1300025.IMQ
        M1300443.IMQ
        M1300552.IMQ
        M1300822.IMQ
        M1301484.IMQ
        M1400008.IMQ
        M1400059.IMQ
        M1400240.IMQ
        M1400242.IMQ
        M1400267.IMQ
        M1400273.IMQ
        M1400310.IMQ
        M1400317.IMQ
        M1400395.IMQ
        M1402151.IMQ
        M1500163.IMQ
        M1500362.IMQ
        M1500608.IMQ
        M1501043.IMQ
        M1501365.IMQ
        M1501479.IMQ
        M1501524.IMQ
        M1502054.IMQ
        M1600063.IMQ
        M1600301.IMQ
        M1601069.IMQ
        M1700189.IMQ
        M1700616.IMQ
        M1800858.IMQ
        M1801041.IMQ
        M1801062.IMQ
        M1801063.IMQ
        M1801112.IMQ
        M1801126.IMQ
        M1801170.IMQ
        M1900192.IMQ
        M1901661.IMQ
        M1901874.IMQ
        M2000336.IMQ
        M2000911.IMQ
        M2001387.IMQ
        M2001426.IMQ
        M2100155.IMQ
        M2100370.IMQ
        M2100496.IMQ
        M2100524.IMQ
        M2100753.IMQ
        M2101814.IMQ
        M2200096.IMQ
        M2200386.IMQ
        M2200441.IMQ
        M2200653.IMQ
        M2200772.IMQ
        M2200841.IMQ
        M2200853.IMQ
        M2200967.IMQ
        M2200972.IMQ
        M2201192.IMQ
        M2201295.IMQ
        M2201336.IMQ
        M2201481.IMQ
        M2202130.IMQ
        M2300003.IMQ
        M2300590.IMQ
        M2300648.IMQ
        M2301106.IMQ
        M2301163.IMQ
        M2301165.IMQ
        M2301583.IMQ
        M2301818.IMQ
        E0100278.IMQ
        E0100931.IMQ
        E0100936.IMQ
        E0101142.IMQ
        E0101282.IMQ
        E0101783.IMQ
        E0101838.IMQ
        E0200123.IMQ
        E0200208.IMQ
        E0200246.IMQ
        E0200295.IMQ
        E0200440.IMQ
        E0200536.IMQ
        E0201094.IMQ
        E0201201.IMQ
        E0201237.IMQ
        E0202112.IMQ
        E0202143.IMQ
        E0202213.IMQ
        E0202798.IMQ
        E0300660.IMQ
        E0300683.IMQ
        E0301976.IMQ
        E0301015.IMQ
        E0301177.IMQ
        E0301528.IMQ
        E0301853.IMQ
        E0302004.IMQ
        E0302067.IMQ
        E0302739.IMQ
        E0400046.IMQ
        E0400083.IMQ
        E0401135.IMQ
        E0401163.IMQ
        E0401812.IMQ
        E0401885.IMQ
        E0401967.IMQ
        E0401973.IMQ
        E0402097.IMQ
        E0500108.IMQ
        E0500334.IMQ
        E0500449.IMQ
        E0500659.IMQ
        E0500728.IMQ
        E0500808.IMQ
        E0500849.IMQ
        E0501077.IMQ
        E0501083.IMQ
        E0501769.IMQ
        E0502494.IMQ
        E0502495.IMQ
        E0502498.IMQ
        E0502502.IMQ
        E0600353.IMQ
        E0600589.IMQ
        E0600590.IMQ
        E0600591.IMQ
        E0600592.IMQ
        E0600593.IMQ
        E0600594.IMQ
        E0600595.IMQ
        E0600596.IMQ
        E0600597.IMQ
        E0600598.IMQ
        E0600599.IMQ
        E0600600.IMQ
        E0600674.IMQ
        E0600776.IMQ
        E0601386.IMQ
        E0601465.IMQ
        E0700560.IMQ
        E0701103.IMQ
        E0702081.IMQ
        E0800026.IMQ
        E0800039.IMQ
        E0800046.IMQ
        E0800047.IMQ
        E0800053.IMQ
        E0800054.IMQ
        E0800055.IMQ
        E0800233.IMQ
        E0800234.IMQ
        E0800238.IMQ
        E0800239.IMQ
        E0800242.IMQ
        E0800243.IMQ
        E0800244.IMQ
        E0800245.IMQ
        E0800246.IMQ
        E0801025.IMQ
        E0801034.IMQ
        E0801062.IMQ
        E0801181.IMQ
        E0900223.IMQ
        E0900351.IMQ
        E0900473.IMQ
        E0900805.IMQ
        E0900874.IMQ
        E0900906.IMQ
        E0900932.IMQ
        E0901049.IMQ
        E0901190.IMQ
        E0901942.IMQ
        E0902084.IMQ
        E0902088.IMQ
        E0902407.IMQ
        E0902509.IMQ
        E0902538.IMQ
        E0902582.IMQ
        E0902652.IMQ
        E1000035.IMQ
        E1000588.IMQ
        E1001295.IMQ
        E1002335.IMQ
        E1002355.IMQ
        E1002357.IMQ
        E1002480.IMQ
        E1002498.IMQ
        E1002502.IMQ
        E1002523.IMQ
        E1002534.IMQ
        E1002608.IMQ
        E1003233.IMQ
        E1003234.IMQ
        E1003247.IMQ
        E1003252.IMQ
        E1003873.IMQ
        E1003874.IMQ
        E1003887.IMQ
        E1100992.IMQ
        E1101021.IMQ
        E1101051.IMQ
        E1101057.IMQ
        E1101248.IMQ
        E1101250.IMQ
        E1101254.IMQ
        E1101261.IMQ
        E1101630.IMQ
        E1101642.IMQ
        E1101643.IMQ
        E1101646.IMQ
        E1101648.IMQ
        E1102438.IMQ
        E1102448.IMQ
        E1102460.IMQ
        E1102469.IMQ
        E1102474.IMQ
        E1102581.IMQ
        E1102585.IMQ
        E1102586.IMQ
        E1102605.IMQ
        E1102748.IMQ
        E1102954.IMQ
        E1102977.IMQ
        E1103018.IMQ
        E1103025.IMQ
        E1103086.IMQ
        E1103126.IMQ
        E1103134.IMQ
        E1103137.IMQ
        E1103146.IMQ
        E1103163.IMQ
        E1103333.IMQ
        E1103335.IMQ
        E1103349.IMQ
        E1103372.IMQ
        E1103378.IMQ
        E1103380.IMQ
        E1103382.IMQ
        E1103384.IMQ
        E1103388.IMQ
        E1103728.IMQ
        E1103730.IMQ
        E1103739.IMQ
        E1103741.IMQ
        E1103743.IMQ
        E1103747.IMQ
        E1103753.IMQ
        E1103754.IMQ
        E1103759.IMQ
        E1103765.IMQ
        E1103767.IMQ
        E1103769.IMQ
        E1103771.IMQ
        E1104042.IMQ
        E1104512.IMQ
        E1104522.IMQ
        E1104530.IMQ
        E1104532.IMQ
        E1104535.IMQ
        E1104536.IMQ
        E1104540.IMQ
        E1104541.IMQ
        E1104542.IMQ
        E1104548.IMQ
        E1104552.IMQ
        E1104556.IMQ
        E1200133.IMQ
        E1200166.IMQ
        E1200420.IMQ
        E1200432.IMQ
        E1200433.IMQ
        E1200438.IMQ
        E1200439.IMQ
        E1200442.IMQ
        E1200447.IMQ
        E1200448.IMQ
        E1200449.IMQ
        E1200455.IMQ
        E1200457.IMQ
        E1200461.IMQ
        E1200579.IMQ
        E1200580.IMQ
        E1200581.IMQ
        E1200582.IMQ
        E1201088.IMQ
        E1201108.IMQ
        E1201125.IMQ
        E1201129.IMQ
        E1201135.IMQ
        E1201673.IMQ
        E1201897.IMQ
        E1201907.IMQ
        E1202030.IMQ
        E1202034.IMQ
        E1202040.IMQ
        E1202041.IMQ
        E1202047.IMQ
        E1202049.IMQ
        E1202473.IMQ
        E1202497.IMQ
        E1202501.IMQ
        E1202802.IMQ
        E1202806.IMQ
        E1202808.IMQ
        E1203500.IMQ
        E1203505.IMQ
        E1203506.IMQ
        E1203508.IMQ
        E1203516.IMQ
        E1203517.IMQ
        E1203520.IMQ
        E1300003.IMQ
        E1300300.IMQ
        E1300308.IMQ
        E1300315.IMQ
        E1300318.IMQ
        E1300322.IMQ
        E1300349.IMQ
        E1300353.IMQ
        E1300356.IMQ
        E1300358.IMQ
        E1300366.IMQ
        E1300367.IMQ
        E1300368.IMQ
        E1300369.IMQ
        E1300942.IMQ
        E1401086.IMQ
        E1401371.IMQ
        E1401390.IMQ
        E1401984.IMQ
        E1500826.IMQ
        E1500996.IMQ
        E1501684.IMQ
        E1600409.IMQ
        E1600413.IMQ
        E1600428.IMQ
        E1600933.IMQ
        E1600937.IMQ
        E1600939.IMQ
        E1601691.IMQ
        E1601921.IMQ
        E1700297.IMQ
        E1700381.IMQ
        E1700669.IMQ
        E1701421.IMQ
        E1701475.IMQ
        E1701637.IMQ
        E1701646.IMQ
        E1701817.IMQ
        E1800474.IMQ
        E1800663.IMQ
        E1800664.IMQ
        E1800681.IMQ
        E1800694.IMQ
        E1801211.IMQ
        E1801385.IMQ
        E1900369.IMQ
        E1900469.IMQ
        E2001724.IMQ
        E2100154.IMQ
        E2100946.IMQ
        E2101165.IMQ
        E2101230.IMQ
        E2101233.IMQ
        E2101234.IMQ
        E2101235.IMQ
        E2101236.IMQ
        E2300056.IMQ
        E2300345.IMQ
        E2300481.IMQ
        R0100470.IMQ
        R0100595.IMQ
        R0101280.IMQ
        R0200533.IMQ
        R0200663.IMQ
        R0201426.IMQ

The MOC team has identified that the data for the following images
were retrieved from the JPL server during real time operations,
but were not included in the Level 0 Science and Engineering CD-ROMs
and are no longer retrievable at JPL.  These images have been 
included in the archive:
        M0000784.IMQ 
        M0000785.IMQ 
        M0000786.IMQ 
        M0000787.IMQ 
        M0000788.IMQ 
        M0000789.IMQ 
        M0000790.IMQ 
        M0002355.IMQ 
        M0002356.IMQ 
        M0002360.IMQ 
        M0002361.IMQ 
        M0002362.IMQ 
        M0002363.IMQ 
        M0002364.IMQ 
        M0002365.IMQ 
        M0002366.IMQ 
        M0002367.IMQ 
        M0002368.IMQ 
        M0002369.IMQ 
        M0002370.IMQ 
        M0002371.IMQ 
        M0002372.IMQ 
        M0002373.IMQ 
        M0002374.IMQ 
        M0002375.IMQ 
        M0002376.IMQ 
        M0002377.IMQ 
        M0002378.IMQ 
        M0002379.IMQ 
        M0002380.IMQ 
        M0002381.IMQ 
        M0002382.IMQ 
        M0002383.IMQ 
        M0002384.IMQ 
        M0002385.IMQ 
        M0002386.IMQ 
        M0002387.IMQ 
        M0002388.IMQ 
        M0002389.IMQ 
        M0002398.IMQ 
        M0002399.IMQ 
        M0002404.IMQ 
        M0002405.IMQ 
        M0002412.IMQ 
        M0002413.IMQ 
        M0002420.IMQ 
        M0002421.IMQ 
        M0002422.IMQ 
        M0002423.IMQ 
        M0002424.IMQ 
        M0002425.IMQ 
        M0002426.IMQ
        M0002427.IMQ
        M0002428.IMQ 
        M0002429.IMQ 
        M0002430.IMQ 
        M0002431.IMQ 
        M0002432.IMQ 
        M0002433.IMQ 
        M0002434.IMQ 
        M0002435.IMQ 
        M0002436.IMQ 
        M0002437.IMQ 
        M0002438.IMQ 
        M0002439.IMQ 
        M0002440.IMQ 
        M0002441.IMQ 
        M0002442.IMQ 
        M0002443.IMQ 
        M0002444.IMQ 
        M0002445.IMQ 
        M0002446.IMQ 
        M0002447.IMQ 
        M0002456.IMQ 
        M0002457.IMQ 
        M0002466.IMQ 
        M0002467.IMQ 
        M0002472.IMQ 
        M0002473.IMQ 
        M0002480.IMQ 
        M0002481.IMQ 
        M0002482.IMQ 
        M0002483.IMQ 
        M0002484.IMQ 
        M0002485.IMQ 
        M0002486.IMQ 
        M0002487.IMQ 
        M0002490.IMQ 
        M0002491.IMQ 
        M0803941.IMQ
        M1000328.IMQ
        M1000329.IMQ
        M1000336.IMQ
        M1000337.IMQ
        M1000340.IMQ
        M1000347.IMQ
        M1000348.IMQ
        M1801066.IMQ
        E0201541.IMQ
        E0201544.IMQ
        E0201545.IMQ
        E0201546.IMQ
        E0201548.IMQ
        E0201550.IMQ
        E0201549.IMQ
        E0201552.IMQ
        E0201551.IMQ
        E0201555.IMQ
        E0800039.IMQ

The following image ids were used for Mars Relay (MR) data
collections, for either HKTM or actual science data collection
attempts for the Mars Polar Lander (MPL) and the two Deep
Space 2 (DS2) probes during the Mars Surveyor '98 (MS98)
mission.  The MOC was used as a data relay source only and
the MR data are therefore not archived with the MOC data on
this volume, but rather will be published as seperate data set.
        M0302732
        M0302743
        M0302744
        M0302753
        M0302754
        M0901080
        M0906605
        M1000001
        M1000153
        M1000303
        M1000424
        M1000425
        M1000426
        M1000427
        M1000432
        M1000437
        M1000450
        M1000453
        M1000460
        M1000463
        M1000468
        M1000477
        M1000496
        M1000524
        M1000537
        M1000542
        M1000547
        M1000554
        M1000557
        M1000560
        M1000569
        M1000580
        M1000606
        M1000624
        M1000646
        M1000666
        M1000671
        M1000676
        M1000681
        M1000684
        M1000700
        M1000722
        M1000736
        M1000737
        M1000742
        M1000745
        M1000754
        M1000763
        M1000774
        M1000779
        M1000802
        M1000859
        M1000903
        M1000915
        M1001029
        M1002023
        M1002105
        M1002219
        M1002243
        M1002334
        M1002487
        M1002614
        M1002673
        M1002778
        M1002882
        M1002975
        M1003107
        M1003252
        M1003498
        M1003506
        M1003597
        M1100040
        M1100155
        M1100317
        M1100459
        M1100614
        M1100804
        M1101058
        M1101144
        M1101152
        M1101335
        M1101429
        M1101560
        M1101609
        M1101622
        M1101786
        M1101825
        M1102019
        M1102100
        M1102266
        M1102450
        M1102453
        M1102568
        M1102698
        M1102787
        M1102940
        M1103601
        M1103788
        M1103911
        M1104011
        M1104236
        M1104322
        M1200069
        M1200134
        M1200256
        M1200364
        M1200512
        M1200660
        M1200761
        M1200870
        M1200929
        M1201023
        M1201107
        M1201217
        M1201350
        M1201447
        M1201549
        M1201618
        M1201723
        M1201864
        M1201906
        M1202004
        M1202160
        M1202245
        M1202334
        M1202393
        M1202530
        M1202549
        M1202654
        M1202765
        M1202865
        M1300055
        M1300111
        M1300172
        M1300266
        M1300355
        M1300403
        M1300426
        E0401082
        E0401148
        E0502682
        E0502939
        E0502946
        E0502953
        E0503074
        E0503079
        E0503086

The PC version of the readmoc software does not work on some images.
We are planning to fix this as soon as possible, and the update will
be available on the website specified in readmoc.txt.  If the user
has access to SunOS/Solaris, it is recommended that readmoc be run
on that platform in the meantime, as the sunos readmoc version does
not appear to exhibit this problem.

Regarding numbering of planning periods (see aareadme.txt):
Starting on 01 September 1999, the planning periods were defined to
start on the first of each month (specifically at the first descending
equator crossing occuring after 0 GMT on the first of each month).
Simultaneously, the numbering scheme was synchronized such that 
September 1999, the seventh month of MGS Mapping, was named M07.
Subsequent months are named M08, M09, etc.
Therefore, the denominations of M05 and M06 were not used.
On 01 February 2001, the First Extended Mission Phase began (see 
mission.cat).  This coincided with the start of a second Mars year
of science data acquisitions with MGS, with an Ls close to that at
the beginning of the Mapping Mission Phase.  The planning periods
used by the MOC team were therefore denoted E01, E02, etc. starting
at the first descending equator crossing after 01 February 2001.
On 01 January 2003, we began the third Mars year of science data 
acquisitions with MGS, with an Ls close to that at the beginning 
of the Mapping Mission Phase. One of the primary goals of this part
of the mission is to provide relay support for Mars Exploration Rover
(MER) Project; reflecting this, the planning periods used by the MOC
team were denoted R01, R02, etc. starting at the first descending
equator crossing after 01 January 2003.

The MGS/MOC team has made every effort to comply with PDS standards
known to us at the time the volume was generated, but for some parts 
of the MOC volume as presented here either no standard was available 
or ambiguities existed.  Producers of future PDS volumes should consult
the latest available PDS Standard for generation of their own volumes.
In particular, at the time of the creation of the MOC products, PDS
standards for labeling software packages had not been defined, so
the software directory tree contains no labeling information.