# Data model: *_img_L1_1.fits

## File contents
| HDU  | data                    | note       |
|------|-------------------------|------------|
| HDU0 | None                    | PrimaryHDU |
| HDU1 | reduced image (9k x 9k) | ImageHDU   |


## HDU0
| keyword | value | comment       | fallback_value | type | module    |
|---------|:------|---------------|----------------|------|-----------|
| SIMPLE  | True  | Fits standard | True           | bool | csst_sims |     
## HDU1

### Header

| keyword   | value                     | comment                       | fallback_value | type | module                  |
|-----------|:--------------------------|-------------------------------|----------------|------|-------------------------|
| RADESYS   | 'ICRS    '                | should be always 'ICRS'       | 'ICRS'                | str  | csst_ms_mbi_distortion  |                             
| STAR_FIT  | 11                        |                               | 0                     | i8   | csst_ms_mbi_distortion  | 
| PV1_0     | 0.003205383944913964      |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV1_1     | 0.8673020820536499        |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV1_2     | -0.2011989871377834       |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV1_3     | -0.2597214229472611       |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV1_4     | 0.4353828741811097        |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV1_5     | -0.5054216569802673       |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV1_6     | 0.1951474426617432        |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV2_0     | 0.00109803885992697       |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV2_1     | 0.9171065857705857        |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV2_2     | -0.04908256792722099      |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV2_3     | -0.09860562038448289      |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV2_4     | 0.07961855240788976       |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV2_5     | -0.2009224365497067       |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| PV2_6     | 0.1741954691884874        |                               | 0                     | f64  | csst_ms_mbi_distortion  |
| RA_OFF    | -0.0                      | mas in unit                   | -99                   | f64  | csst_ms_mbi_distortion  |
| DEC_OFF   | 0.0                       | mas in unit                   | -99                   | f64  | csst_ms_mbi_distortion  |
| RA_STD    | 127.1                     | mas in unit                   | -99                   | f64  | csst_ms_mbi_distortion  |
| DEC_STD   | 60.4                      | mas in unit                   | -99                   | f64  | csst_ms_mbi_distortion  |
| RA_CEN    | 192.1940713422841         | the center of detector in ra  | -99                   | f64  | csst_ms_mbi_distortion  |
| DEC_CEN   | 26.72643742371229         | the center of detector in dec | -99                   | f64  | csst_ms_mbi_distortion  |
| DIST_V    | '1.0     '                | version of distortion         | '0.0'                 | str  | csst_ms_mbi_distortion  |
| DIST_TOL  | '2022-12-29T16:36:47'     | distortion operation time     | '2022-12-29T16:36:47' | str  | csst_ms_mbi_distortion  |