Glossary

• rawx raw detector x position (i.e., before rotation and aspect correction)($\equiv$dx for Rev0)
• rawy raw detector y position (i.e., before rotation and aspect correction)($\equiv$dy for Rev0)
• detx detector x position after correction
• dety detector y position after correction
• pha pulse height analyzer channel. Accepted values 0-15 (Einstein IPC), 1-256 (ROSAT PSPC)
• pi pulse invariant bin (energy). Accepted values 0-15 (Einstein IPC), 1-256 (ROSAT PSPC) and 1-34 (ROSAT PSPC, SASS output).
• region a selected region of the image of various forms. Used to select only a portion of the image, within which the current operations should be applied.
• time photon arrival time in sec.
  • from Jan. 0, 1978, for Einstein data
  • Spacecraft clock time (can be converted to UT) from 21:06:50.2 June 1, 1990 for ROSAT data
• x - y pixel position in sky pixel (i.e., after aspect correction). Values start from 1 in the lower left corner