OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = SC_RECV_TIME DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 8 START_BYTE = 1 DESCRIPTION = " The time this packet was received by the spacecraft, in ticks (256 per second). " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = CEB_TIME DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 8 START_BYTE = 9 DESCRIPTION = " Clock count from the GRS Common Electronics Box at the beginning of the pixel. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = UTC DATA_TYPE = CHARACTER BYTES = 23 START_BYTE = 17 DESCRIPTION = " Time at the middle of the collection interval converted to UTC, stored as yyyy-mm-ddThh:mm:ss.sss. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = GRS_PIXEL_NUMBER DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 START_BYTE = 40 INVALID_CONSTANT = 0 DESCRIPTION = " Sequential counter of accumulation intervals, starts with one as grs orbit begins. Special case on reboot when the the CEB is in orbit 0, pixel 0. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = GRS_ORBIT_NUMBER DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 START_BYTE = 44 INVALID_CONSTANT = 0 DESCRIPTION = " Sequential counter of orbits from GRS CEB boot. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = ODY_ORBIT_NUMBER DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 4 START_BYTE = 48 INVALID_CONSTANT = 0 DESCRIPTION = " Orbit number common to all instruments aboard Odyssey. This orbit number is incremented by one as the spacecraft passes through the orbital descending node. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = AREOCENTRIC_LATITUDE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 52 UNIT = DEGREE DESCRIPTION = " Sub spacecraft latitude in Mars fixed coordinates at the middle of the collection interval. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = AREOCENTRIC_EAST_LONGITUDE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 56 UNIT = DEGREE DESCRIPTION = " Sub spacecraft longitude in Mars fixed coordinates at the middle of the collection interval. Longitude increases towards the East. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = ALTITUDE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 60 UNIT = KILOMETER DESCRIPTION = " Areocentric altitude of the sub-spacecraft point in Mars-fixed rotating frame at the middle of the collection interval. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = SCPOS_INERT DATA_TYPE = IEEE_REAL BYTES = 12 START_BYTE = 64 UNIT = KILOMETER ITEMS = 3 ITEM_BYTES = 4 DESCRIPTION = " The geometric position (x,y,z) of the spacecraft with respect to Mars in the 'MARSIAU' IAU2000 reference system inertial frame at the input epoch 'et' at the middle of the pixel. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = SCVEL_INERT DATA_TYPE = IEEE_REAL BYTES = 12 START_BYTE = 76 UNIT = "KILOMETER/SECOND" ITEMS = 3 ITEM_BYTES = 4 DESCRIPTION = " The geometric velocity (x,y,z) of the spacecraft with respect to Mars in the 'MARSIAU' IAU2000 reference system inertial frame at the input epoch 'et' at the middle of the pixel. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = MARSPOS_INSTR DATA_TYPE = IEEE_REAL BYTES = 12 START_BYTE = 88 UNIT = KILOMETER ITEMS = 3 ITEM_BYTES = 4 DESCRIPTION = " The (x,y,z) position of the sub-spacecraft point as seen from the spacecraft in the instrument frame at the middle of the collection interval. If no spacecraft orientation data was available from the loaded CK files for the request time, then all elements of are set to zero. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = MARSVEL_INSTR DATA_TYPE = IEEE_REAL BYTES = 12 START_BYTE = 100 UNIT = "KILOMETER/SECOND" ITEMS = 3 ITEM_BYTES = 4 DESCRIPTION = " Contains the inertial spacecraft velocity direction (x,y,z) rotated to the instrument frame at the middle of the collection interval. If no spacecraft orientation data was available for the request time, then all elements are set to zero. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = DAY_INDEX DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 START_BYTE = 112 DESCRIPTION = " Day of Martian year. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = LOCAL_HOUR DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 START_BYTE = 114 DESCRIPTION = " Local Sun hour at the sub-spacecraft point. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = LOCAL_MINUTE DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 START_BYTE = 116 DESCRIPTION = " Local Sun minute at the sub-spacecraft point. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = PIXEL_DURATION DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 118 UNIT = SECOND DESCRIPTION = " Length of the collection interval in seconds. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 18 NAME = POWER_SUPPLY DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 START_BYTE = 122 DESCRIPTION = " Which power supply is being used, 1 or 2. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 19 NAME = SWAP_FLAG DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 START_BYTE = 124 DESCRIPTION = " The state of the prompt/delayed swap flag. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 20 NAME = POWER_LEVEL DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 2 START_BYTE = 126 DESCRIPTION = " The power level of the power supply in use during the collection interval, 1 being highest power and 7 being lowest power. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 21 NAME = DIRECTION DATA_TYPE = MSB_UNSIGNED_INTEGER BYTES = 1 START_BYTE = 128 DESCRIPTION = " Direction of spacecraft travel N(1) or S(0). " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 22 NAME = LIVETIME DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 129 UNIT = SECOND DESCRIPTION = " In seconds, duration - deadtime, where deadtime = dead_cnt * .000512 sec. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 23 NAME = DEADTIME_PERCENT DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 133 DESCRIPTION = " Deadtime / duration. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 24 NAME = OVERLOAD_RATE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 137 DESCRIPTION = " The OVERLOAD_RATE gives an estimate of the flux of charged particles that deposit energies greater than about 2.6 MeV. The OVERLOAD_RATE is determined by dividing the EDR GCR_CNT field by 110 cm2, which is the average projected area of the spectrometer, and by the collection interval duration (DND PIXEL_DURATION field). The units are centimeters squared per second. Note that the GCR_CNT field gives the number of overload events during a collection interval, corresponding to events that produce greater than 2.6 MeV equivalent light output. While these events can be caused by gamma rays and neutrons, most are associated with energetic particles. When the OVERLOAD_RATE is lowest, overload events are dominated by galactic cosmic rays, in which case the OVERLOAD_RATE gives an estimate of the galactic cosmic ray flux. The OVERLOAD_RATE is primarily used to identify periods of high count rate, which corresponding to energetic particle events. Such events are filtered from the DND data set by the processing algorithms. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 25 NAME = HVPS_MNTR_2 DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 141 UNIT = VOLT DESCRIPTION = " The value of the High Voltage Power Supply Monitor 2 at the mid point of the collection interval that has been smoothed with a Gaussian weighted smoothing algorithm over 30 HVPS_MNTR_2 measurements and interpolated to the time at the middle of the NS collection interval from the HVPS_MNTR_2 engineering measurement that happens just before the NS collection interval and the one just after the NS collection interval. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 26 NAME = LAT_1 DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 145 UNIT = DEGREE DESCRIPTION = " Latitude in degrees to be associated with CAT1, Prism 1 count rate and error " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 27 NAME = LON_1 DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 149 UNIT = DEGREE DESCRIPTION = " Longitude in degrees to be associated with CAT1, Prism 1 count rate and error " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 28 NAME = LAT_4_5 DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 153 UNIT = DEGREE DESCRIPTION = " Latitude in degrees to be associated with the thermal count rate and error " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 29 NAME = LON_4_5 DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 157 UNIT = DEGREE DESCRIPTION = " Longitude in degrees to be associated with the thermal count rate and error " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 30 NAME = CAT1_PRISM1_PEAK_AREA DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 161 DESCRIPTION = " The counting rate given by the area in the 10B(n,alpha)7Li reaction peak above background registered by prism 1, in units of s^-1. The counting rate as measured is normalized by the ratio of the average Cat1 Prism1 counting rate averaged over all transits between +30 degrees and -30 degrees latitude measured within +0.5 and -0.5 days of the current data point. This counting rate is also the epithermal neutron counting rate. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 31 NAME = CAT1_PRISM1_ERROR DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 165 DESCRIPTION = " The 1-sigma statistical error of the CAT1_PRISM1_PEAK_AREA (counts/s). " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 32 NAME = CAT1_PRISM2_PEAK_AREA DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 169 DESCRIPTION = " The counting rate given by the area in the 10B(n,alpha)7Li reaction peak above background registered by prism 2, in units of s^-1. The counting rate as measured is normalized by the ratio of the average Cat1 Prism2 counting rate averaged over all transits between +30 degrees and -30 degrees latitude measured within +0.5 and -0.5 days of the current data point. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 33 NAME = CAT1_PRISM2_ERROR DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 173 DESCRIPTION = " The 1-sigma statistical error of the CAT1_PRISM2_PEAK_AREA (counts/s). " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 34 NAME = CAT1_PRISM3_PEAK_AREA DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 177 DESCRIPTION = " The counting rate given by the area in the 10B(n,alpha)7Li reaction peak above background registered by prism 3, in units of s^-1. The counting rate as measured is normalized by the ratio of the average Cat1 Prism3 counting rate averaged over all transits between +30 degrees and -30 degrees latitude measured within +0.5 and -0.5 days of the current data point. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 35 NAME = CAT1_PRISM3_ERROR DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 181 DESCRIPTION = " The 1-sigma statistical error of the CAT1_PRISM3_PEAK_AREA (counts/s). " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 36 NAME = CAT1_PRISM4_PEAK_AREA DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 185 DESCRIPTION = " The counting rate given by the area in the 10B(n,alpha)7Li reaction peak above background registered by prism 4, in units of s^-1. The counting rate as measured is normalized by the ratio of the average Cat1 Prism4 counting rate averaged over all transits between +30 degrees and -30 degrees latitude measured within +0.5 and -0.5 days of the current data point. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 37 NAME = CAT1_PRISM4_ERROR DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 189 DESCRIPTION = " The 1-sigma statistical error of the CAT1_PRISM4_PEAK_AREA (counts/s). " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 38 NAME = CAT2_PRISM1_FAST_SUM DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 193 DESCRIPTION = " The sum of the counting rate in the lowest two channels of the [(early-time) - (late time)] fast-neutron histograms, in units of s^-1. The counting rate as measured is normalized by the ratio of the average CAT2_PRISM1_FAST_SUM counting rate averaged over all transits between +30 degrees and -30 degrees latitude measured within +0.5 and -0.5 days of the current data point. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 39 NAME = CAT2_PRISM1_ERROR DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 197 DESCRIPTION = " The 1-sigma statistical error of the CAT2_PRISM1_FAST_SUM (counts/s). " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 40 NAME = THERMAL_COUNT_RATE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 201 DESCRIPTION = " The difference between CAT1_PRISM2_Peak_Area and CAT1_PRISM4_Peak_Area, in units of s^-1. The counting rate as measured is normalized by the ratio of the Thermal Count Rate averaged over all transits between +30 degrees and -30 degrees latitude measured within +0.5 and -0.5 days of the current data point. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 41 NAME = THERMAL_ERROR DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 205 DESCRIPTION = " The 1-sigma statistical error of the THERMAL_COUNT_RATE (counts/s) " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 42 NAME = CAT1_PRISM1_NORM_SLOPE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 209 DESCRIPTION = " The slope parameter for the bellyband normalization for the CAT1_PRISM1_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 43 NAME = CAT1_PRISM1_NORM_OFFSET DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 213 DESCRIPTION = " The offset parameter for the bellyband normalization for the CAT1_PRISM1_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 44 NAME = CAT1_PRISM2_NORM_SLOPE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 217 DESCRIPTION = " The slope parameter for the bellyband normalization for the CAT1_PRISM2_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 45 NAME = CAT1_PRISM2_NORM_OFFSET DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 221 DESCRIPTION = " The offset parameter for the bellyband normalization for the CAT1_PRISM2_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 46 NAME = CAT1_PRISM3_NORM_SLOPE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 225 DESCRIPTION = " The slope parameter for the bellyband normalization for the CAT1_PRISM3_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 47 NAME = CAT1_PRISM3_NORM_OFFSET DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 229 DESCRIPTION = " The offset parameter for the bellyband normalization for the CAT1_PRISM3_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 48 NAME = CAT1_PRISM4_NORM_SLOPE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 233 DESCRIPTION = " The slope parameter for the bellyband normalization for the CAT1_PRISM4_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 49 NAME = CAT1_PRISM4_NORM_OFFSET DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 237 DESCRIPTION = " The offset parameter for the bellyband normalization for the CAT1_PRISM4_PEAK_AREA. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 50 NAME = CAT2_PRISM1_NORM_SLOPE DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 241 DESCRIPTION = " The slope parameter for the bellyband normalization for the CAT2_PRISM1_FAST_SUM. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 51 NAME = CAT2_PRISM1_NORM_OFFSET DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 245 DESCRIPTION = " The offset parameter for the bellyband normalization for the CAT2_PRISM1_FAST_SUM. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 52 NAME = CF_ATM_EPI DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 249 DESCRIPTION = " Correction factor for atmospheric mass for epithermal neutrons. " END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 53 NAME = CF_ATM_FAST DATA_TYPE = IEEE_REAL BYTES = 4 START_BYTE = 253 DESCRIPTION = " Correction factor for atmospheric mass for fast neutrons. " END_OBJECT = COLUMN