PDS_VERSION_ID = PDS3 /* FILE CHARACTERISTICS */ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 50 FILE_RECORDS = 4050 /* POINTERS TO DATA OBJECTS */ ^TABLE = "HEND_EPITHERMAL_020917.TAB" /* DESCRIPTIVE DATA ELEMENTS */ INSTRUMENT_HOST_NAME = "2001 MARS ODYSSEY" INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER" SPACECRAFT_ID = ODY TARGET_NAME = MARS MISSION_PHASE_NAME = MAPPING PRODUCT_CREATION_TIME = 2002-09-17T00:00:00.000Z /* DATA OBJECT DEFINITION */ OBJECT = TABLE NAME = "HEND EPITHERMAL NEUTRON FLUX" INTERCHANGE_FORMAT = ASCII ROWS = 4050 ROW_BYTES = 50 COLUMNS = 3 DESCRIPTION = "This table contains data used to generate Figure 1 in Mitrofanov et al., Maps of Subsurface Hydrogen from the High Energy Neutron Detector, Mars Odyssey, Science, 297, 78-81, 2002. The figure is a map of epithermal neutron flux measured by HEND with energies at 0.4 eV to 100 keV for the first 55 days of mapping. The map is normalized to 1 at the pixel with the highest count rate, 0.26 counts per second in Solis Planum (270 deg E, 30 deg S)." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "LONGITUDE" DATA_TYPE = ASCII_REAL FORMAT = "F12.7" UNIT = "DEGREE" BYTES = 12 START_BYTE = 4 DESCRIPTION = "Longitude of center of 4 by 4 degree area. Values range from -180 to 180, increasing to the east." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "LATITUDE" DATA_TYPE = ASCII_REAL FORMAT = "F11.7" UNIT = "DEGREE" BYTES = 11 START_BYTE = 23 DESCRIPTION = "Latitude of center of 4 by 4 degree area." END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "EPITHERMAL NEUTRON FLUX" DATA_TYPE = ASCII_REAL FORMAT = "F8.6" UNIT = "COUNTS/SECOND" SCALING_FACTOR = 0.26 BYTES = 8 START_BYTE = 41 DESCRIPTION = "Normalized epithermal neutron flux for the given 4 by 4 degree area. To get original value in counts per second, multiply by SCALING_FACTOR." END_OBJECT = COLUMN END_OBJECT = TABLE END