PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2003-10-01 NOTE = "INFO.TXT describes the MARIE raw data available on this volume." END_OBJECT = TEXT END The DATA/RAW_DATA directory contains the MARIE raw reformatted (REDR) event data. These data were acquired by the MARIE instrument aboard the Mars Odyssey spacecraft. The REDR data set includes data files of six different types. These types are described below. The RAW_DATA subdirectory only contains data of the Event (EVN) and Count (CNT) types. Data of the other four types are ancillary data, and are housed under the subdirectory DATA/ANCIL. IMPORTANT: Please note that the time tags of these data contain errors. See the file ERRATA.TXT on this disk for details on these and other problems regarding the disk. The six types of raw data are: (1) Event files (file type EVN): These are binary table files. Each record in an event file contains data pertaining to a specific event. An event is considered to occur when a signal is detected by the A1 and A2 cards and is above threshold for both of these cards. (2) Count files (file type CNT): These are binary table files containing records of counts (in any card) over one-minute periods. (3) Detector files (file type DET): These are ASCII table files which describe the detector temperatures. At the beginning of each file is a table header which names the columns. (4) High Voltage files (file type EXT): These are ASCII table files which describe the voltages in the electronic boards. At the beginning of each file is a table header which names the columns. (5) Board files (file type BRD): These are ASCII table files which describe the board temperatures. At the beginning of each file is a table header which names the columns. (6) Power files (file type PWR): These are ASCII table files which describe the power consumption of the detectors. At the beginning of each file is a table header which names the columns. A detailed description of the raw data is found in the file /CATALOG/RAW_DATASET.CAT on this disk. The data files in the RAW_DATA directory are organized into one-month subdirectories. Each such subdirectory contains the data for one calendar month, as determined from the dates in the names of the data files. The naming conventions for the files and subdirectories in RAW_DATA are as follows. Please note that these are NOT the same as the file naming conventions for reduced data (see below for details). In RAW_DATA, file name EVN01175_02.DAT is interpreted as: EVN = file type (in this case, an event file) 01 = year 2001 175 = day of year 175 (where Jan. 1 = day of year 001) 02 = second file of day DAT = binary data file Subdirectory name 01_06JUN is interpreted as: 01 = year 2001 06JUN = sixth month, June The month is referenced twice in each subdirectory name - first as a number (06) to facilitate automatic search, then as an abbreviation (JUN) to make the name more human-readable. Note that the 'starting day' for a file is not the first day of the data in the file, but the day that the data were downloaded by the instrument team. This is different from the way that the 'starting day' is defined for naming of calibrated data files (in /DATA/REDUCED). To find out which days of data are in a raw data file, consult the START_TIME and STOP_TIME lines in the detached PDS label file (*.LBL) accompanying the data file. The detached PDS label file describing the file EVN01175_02.DAT is named EVN01175_02.LBL. In addition to the data files, this disk contains documentation files which describe the data sets on the disk, the instrument from which the data came, and the Mars Odyssey spacecraft and mission. These files are found in the CATALOG and DOCUMENT directories, and are described in the files CATALOG/CATINFO.TXT and DOCUMENT/DOCINFO.TXT. NOTE ON 6-BYTE REAL VALUES: A few of the columns in the event and count files have the format of a 6-byte real number. This format is described in the file RAW_DATASET.CAT in the CATALOG directory on this disk. In the PDS labels for these data, the 6-byte reals are declared as character strings to avoid compatibility problems. Hence these reals may be displayed as seemingly random character strings by some software.