csst_ms_sls2d.md

# L1-MBI Data model

## File: \*\_img_L1_1.fits

### File contents

| HDU  | data                    | note       |
| ---- | ----------------------- | ---------- |
| HDU0 | None                    | PrimaryHDU |
| HDU1 | reduced image (9k x 9k) | ImageHDU   |
| HDU2 | reduced error (9k x 9k) | ImageHDU   |
| HDU3 | reduced DQ (9k x 9k)    | ImageHDU   |

### HDU0

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

### HDU1

#### Header of `csst_ms_sls_instrument`

| keyword  | value                 | comment                                        | fallback_value | type | module                 |
| -------- | :-------------------- | ---------------------------------------------- | -------------- | ---- | ---------------------- |


#### Header of `csst_ms_sls_position`

| 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 |
| FIT_STAR   | 10                   |                              | 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_STD     | 127.1                | mas in unit                  | -99            | f32  | csst_ms_sls_position |
| DEC_STD    | 60.4                 | mas in unit                  | -99            | f32  | csst_ms_sls_position |
| FIT_STATUS | 0                    | 0 for success, 1 for failure | 1              | i8   | csst_ms_sls_position |

#### Header of `csst_ms_sls_qc1`

| keyword | value   | comment                 | fallback_value | type | module               |
| ------- | :------ | ----------------------- | -------------- | ---- | -------------------- |