process_fits reads the following keywords and sets the variable.

• BITPIX - BITPIX -- This sets the flag in SPC for how many bits to treat the data. Everything is eventually converted into unsigned integer. For ORex, this is 16. The camera is a 14-bit imager, but the SPOC will pad the leading bits to 0 to make it a simple unsigned 16-bit integer. IF a LUT (look-up-table) is used, the SPOC will convert the 8-bit LUT into the standard 16-bit integers.
• DATE_OBS - UTC0 -- The UTC time of the observation. This is converted within SPC via SPICE into ET, setting both ET0 and ET.

• EXPTIME - EXP -- The duration of the exposure. It is used to calculate the midpoint of the exposure. This is _ used for OREx.

• SCLK_STR -- CLK0 and CKLUSE - This is the spacecraft clock. If this value is set in the FITS headers, it is the primary time used to calculate the midpoint of the exposure.
• NAXIS1 NPX)
• NAXIS2 (NLN)
• CAMERAID (CAM)
• MTR_POS (FLT)
• LUT (LUT)

• MCFWHTMP - NTX (1,1) -- MapCam temperature. The final algorithm has not been decided yet. However, the weighting of each temperature can be adjusted in the file DN2TEMP.TXT. This assumes a linear mixing of the four camera temperatures.

• MCFWMTMP - NTX (1,2)
• MCLENTMP - NTX (1,3)
• MCROETMP - NTX (1,4)

• SCFWHTMP - NTX (2,1) -- SamCam temperature. The final algorithm has not been decided yet. However, the weighting of each temperature can be adjusted in the file DN2TEMP.TXT. This assumes a linear mixing of the four camera temperatures.

• SCFWMTMP - NTX (2,2)
• SCLENTMP - NTX (2,3)
• SCROETMP - NTX (2,4)

• PCFWHTMP - NTX (3,1) -- PolyCam temperature. The final algorithm has not been decided yet. However, the weighting of each temperature can be adjusted in the file DN2TEMP.TXT. This assumes a linear mixing of the four camera temperatures.

• PCFWMTMP - NTX (3,2)
• PCLENTMP - NTX (3,3)
• PCROETMP - NTX (3,4)

• NCCHTEMP - NTX (4,0) and NTX (4,1) -- NavCam temperature

• TCCHTEMP - NTX (5,0) and NTX (5,1) -- TAGCam temperature

• SC_QA - QT(0) -- Quadterians. OREx will write the spacecraft pointing information, as of when the image was taken, into the FITS header. process_fits will output them in the file quaternions.txt in the format PICNM, QT(I), I=0,3

• SC_QX - QT(1)
• SC_QY - QT(2)
• SC_QZ - QT(3)
• BZERO - DDN and SIGNED -- FORTRAN reads all integers as signed. If the data should be unsigned, then the DN values less than zero are converted into high-bit values
• INSTRUME - INAME and NC -- This is the name of the instrument in human-readable form. It sets the variable NC as follows:

  • INSTRUME	NC
    MAP	1
    SAM	2
    POL	3
    NCM	4
    NFT	5

The order of this is important because the camera number is the reference that SPC uses for camera ID within the configuration files make_sumfiles.txt], [[DN2TEMP, and FLATFIELD.TXT