When untarred, the file yields a directory named after the ObsId which contains:
- Index files for the various Spacecraft Subsystems.
These have names like FIAC_473e891-47430c1.
- FMI (FITS Master Index) file.
This provides a description of the contents of the directory. It is used by XDF - the XTE Data Finder - to identify the underlying data files.
- Spacecraft Subsystem directories.
All are present, but only the essential subsystems, listed below, actually contain files:
acs - Attitude Control System (only AppIds 14, 15)
clock - Time delta correction data from Mission Operations Center
fds - Flight Data System (only AppId 1)
- hexte - HEXTE science and housekeeping data (all AppIds when available, except
- burst mode, i.e. 80, 82, 83, 84, 85, 86, 88, 89, 251, 252, 253, 254)
orbit - Orbit ephemeris from the Flight Dynamics Facility
-
pca - PCA science and housekeeping data (all AppIds when available, i.e. 55, 59, 63,
- 70, 74, 79, 90-94)
-
stdprod - Standard products generated by the XSDC (only the data files with raw
- data, i.e. 237, 238, 239, 240, 241, 242, 243)
Though they represent the lowest rung in the directory hierarchy, the Subsystem directories do not necessarily contain files of one type. In most cases, a further division is made based on Application, the term used for a distinct source of telemetry. In the case of the PCA, the six Event Analyzers are considered applications. Note that the ASM is not included.
Files in the acs, fds, hexte, pca and stdprod directories require gunzip to be run before use.
