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| HDU | data | note |
|-------|-------------------------|-------------|
| HDU0 | None | PrimaryHDU |
| HDU1 | reduced SCI (9k x 9k) | ImageHDU |
| HDU2 | reduced ERR (9k x 9k) | ImageHDU |
| HDU3 | reduced DQ (9k x 9k) | ImageHDU |
### *HDU0 --> HDU1
| keyword | value | comment | fallback_value | type | module |
|--------------------|:-----------------------|----------------------------------------------|-----------------------|--------|-------------------------|
| SIMPLE | T | Fits standard | T | bool | csst_ms_sls_instrument |
| BITPIX | 8 | array data value | 8 | i8 | csst_ms_sls_instrument |
| NAXIS | 0 | Number of axes | 0 | i8 | csst_ms_sls_instrument |
| EXTEND | T | file may contain standard extensions | T | bool | csst_ms_sls_instrument |
| NEXTEND | 3 | Number of file extensions | 3 | i8 | csst_ms_sls_instrument |
| *VER_CRDS | '0.0.1 ' | Version of CRDS file selection software used | '0.0.1 ' | str | csst_ms_sls_instrument |
| R_GAIN | '*.gain.fits' | Gain reference file name | 'N/A' | str | csst_ms_sls_instrument |
| R_READN | '*.rn.fits' | Read noise reference file name | 'N/A' | str | csst_ms_sls_instrument |
| R_SATURA | '*.sat.fits' | Saturation reference file name | 'N/A' | str | csst_ms_sls_instrument |
| R_MASK | '*.msk.fits' | Mask reference file name | 'N/A' | str | csst_ms_sls_instrument |
| R_BIAS | '*bias.fits' | SuperBias reference file name | 'N/A' | str | csst_ms_sls_instrument |
| R_DARK | '*dark.fits' | Dark reference file name | 'N/A' | str | csst_ms_sls_instrument |
| R_DFLAT | '*flat.fits' | Detector Flat reference file name | 'N/A' | str | csst_ms_sls_instrument |
| R_SFLAT | '*flat.fits' | Spectrograph Flat reference file name | 'N/A' | str | csst_ms_sls_instrument |
| S_DQINI | T | Data Quality Initialization | F | bool | csst_ms_sls_instrument |
| S_SATURA | T | Saturation Checking | F | bool | csst_ms_sls_instrument |
| S_ERRINI | T | Error Initialization | F | bool | csst_ms_sls_instrument |
| S_BIAS | T | Bias correction | F | bool | csst_ms_sls_instrument |
| S_DARK | T | Dark correction | F | bool | csst_ms_sls_instrument |
| S_FLAT | T | Flat field correction | F | bool | csst_ms_sls_instrument |
| *VER_INST DCP_VER | '0.0.1 ' | detector-level calibration pipeline version | '0.0.1 ' | str | csst_ms_sls_instrument |
| *STM_INST DCP_TIME | '2022-12-30T10:18:53' | pipeline processing time | '2022-12-30T10:18:53' | str | csst_ms_sls_instrument |
| HISTORY | '**step complete.' | record processing message | 'null' | str | csst_ms_sls_instrument |
### HDU1
#### Header of `csst_ms_sls_instrument`
| keyword | value | comment | fallback_value | type | module |
|-----------|:---------|-------------------------------------------|----------------|-------|--------------------------|
| EXTNAME | SCI | extension name | SCI | str | csst_ms_sls_instrument |
| EXTVER | 1 | extension version number | 1 | i8 | csst_ms_sls_instrument |
| BUNIT | *e-/s | brightness units | *e-/s | str | csst_ms_sls_instrument |
| *NGOODPIX | 84794368 | number of good pixels | 0 | f32 | csst_ms_sls_instrument |
| SDQFLAGS | 31743 | serious data quality flags | 0 | i16 | csst_ms_sls_instrument |
| *GOODMAX | 260.0 | maxmum value of good pixels | 0 | f32 | csst_ms_sls_instrument |
| GOODMIN | -0.001 | minmum value of good pixels | 0 | f32 | csst_ms_sls_instrument |
| GOODMEAN | 0.3 | mean value of good pixels | 0 | f32 | csst_ms_sls_instrument |
| SNRMIN | 187.4 | minmum signal to noise of good pixels | 0 | f32 | csst_ms_sls_instrument |
| SNRMAX | 1.2 | maxmum signal to noise of good pixels | 0 | f32 | csst_ms_sls_instrument |
| SNRMEAN | 3.38 | average of the dark values subtracted | 0 | f32 | csst_ms_sls_instrument |
VER_INST
STA_INST
STM_INST
| keyword | value | comment | fallback_value | type | module |
|------------------|:----------------------|------------------------------|----------------|--------|-----------------------|
| CTYPE1 | 'RA---TPV' | | 'RA---TPV' | str | csst_ms_sls_position |
| CTYPE2 | 'DEC--TPV' | | 'DEC--TPV' | str | csst_ms_sls_position |
| CUNIT1 | 'deg ' | | 'deg' | str | csst_ms_sls_position |
| CUNIT2 | 'deg ' | | 'deg' | str | csst_ms_sls_position |
| RADESYS | 'ICRS ' | | 'ICRS' | str | csst_ms_sls_position |
| PV1_0 | 0.003205383944913964 | | 0 | f32 | csst_ms_sls_position |
| PV1_1 | 0.8673020820536499 | | 0 | f32 | csst_ms_sls_position |
| PV1_2 | -0.2011989871377834 | | 0 | f32 | csst_ms_sls_position |
| PV1_3 | -0.2597214229472611 | | 0 | f32 | csst_ms_sls_position |
| PV1_4 | 0.4353828741811097 | | 0 | f32 | csst_ms_sls_position |
| PV1_5 | -0.5054216569802673 | | 0 | f32 | csst_ms_sls_position |
| PV1_6 | 0.1951474426617432 | | 0 | f32 | csst_ms_sls_position |
| PV2_0 | 0.00109803885992697 | | 0 | f32 | csst_ms_sls_position |
| PV2_1 | 0.9171065857705857 | | 0 | f32 | csst_ms_sls_position |
| PV2_2 | -0.04908256792722099 | | 0 | f32 | csst_ms_sls_position |
| PV2_3 | -0.09860562038448289 | | 0 | f32 | csst_ms_sls_position |
| PV2_4 | 0.07961855240788976 | | 0 | f32 | csst_ms_sls_position |
| PV2_5 | -0.2009224365497067 | | 0 | f32 | csst_ms_sls_position |
| PV2_6 | 0.1741954691884874 | | 0 | f32 | csst_ms_sls_position |
| *NS_POS STAR_FIT | 10 | number of the stars | 0 | i8 | csst_ms_sls_position |
| RA_OFF | -0.0 | mas in unit | -99 | f32 | csst_ms_sls_position |
| DEC_OFF | 0.0 | mas in unit | -99 | f32 | csst_ms_sls_position |
| RA_RMS | 127.1 | mas in unit | -99 | f32 | csst_ms_sls_position |
| DEC_RMS | 60.4 | mas in unit | -99 | f32 | csst_ms_sls_position |
| RA_CEN | 193.299027 | center of detector in ra | 0 | f32 | csst_ms_sls_position |
| DEC_CEN | 26.08851 | center of detector in dec | 0 | f32 | csst_ms_sls_position |
| *VER_POS | '1.0' | version of distortion | '1.0' | str | csst_ms_sls_position |
| *STM_POS | '2023-02-16 12:15:16' | time of last modification | | str | csst_ms_sls_position |
| *STA_POS | 0 | 0 for done, 1 for failure | 1 | i8 | csst_ms_sls_position |
| keyword | value | comment | fallback_value | type | module |
|----------------|:---------|------------------------------|----------------|-------|-----------------|
| *STA_QC1 QC1_S | 0 | 0 for success, 1 for failure | 1 | i8 | csst_ms_sls_qc1 |
| VER_QC1 | '0.0.1' | QC1 pipeline version | '0.0.1' | str | csst_ms_sls_qc1 |
| QC1_FLAG | 0 | quality flags | -99 | i16 | csst_ms_sls_qc1 |
+ STM_QC1
+
### HDU2
#### Header of `csst_ms_sls_instrument`
| keyword | value | comment | fallback_value | type | module |
|----------|---------------|----------------------------|----------------|---------|-------------------------|
| XTENSION | IMAGE | Image extension | IAMGE | str | csst_ms_sls_instrument |
| BITPIX | -32 | bits per data value | -32 | i8 | csst_ms_sls_instrument |
| NAXIS | 2 | Number of array dimensions | 2 | i8 | csst_ms_sls_instrument |
| NAXIS1 | 9216 | Size of the axis | 9216 | i8 | csst_ms_sls_instrument |
| NAXIS2 | 9232 | Size of the axis | 9232 | i8 | csst_ms_sls_instrument |
| PCOUNT | 0 | number of parameters | 0 | i8 | csst_ms_sls_instrument |
| GCOUNT | 1 | number of groups | 1 | i8 | csst_ms_sls_instrument |
| EXTNAME | ERR | extension name | ERR | str | csst_ms_sls_instrument |
| EXTVER | 1 | extension version number | 1 | i8 | csst_ms_sls_instrument |
| *BUNIT | electrons/s | brightness units | electrons/s | str | csst_ms_sls_instrument |
### HDU3
#### Header of `csst_ms_sls_instrument`
| keyword | value | comment | fallback_value | type | module |
|-----------|-------------|----------------------------|----------------|--------|------------------------|
| XTENSION | IMAGE | Image extension | IAMGE | str | csst_ms_sls_instrument |
| BITPIX | 16 | bits per data value | 16 | i8 | csst_ms_sls_instrument |
| NAXIS | 2 | Number of array dimensions | 2 | i8 | csst_ms_sls_instrument |
| NAXIS1 | 9216 | Size of the axis | 9216 | i8 | csst_ms_sls_instrument |
| NAXIS2 | 9232 | Size of the axis | 9232 | i8 | csst_ms_sls_instrument |
| PCOUNT | 0 | number of parameters | 0 | i8 | csst_ms_sls_instrument |
| GCOUNT | 1 | number of groups | 1 | i8 | csst_ms_sls_instrument |
| EXTNAME | DQ | extension name | DQ | str | csst_ms_sls_instrument |
| EXTVER | 1 | extension version number | 1 | i8 | csst_ms_sls_instrument |
| *BUNIT | unitless | brightness units | unitless | str | csst_ms_sls_instrument |