| AIRMEND | float | Airmass at end of observation | |
| AIRMSTRT | float | Airmass at start of observation | |
| astrom | Astrom | Information about the astrometry | |
| chip | Chip | Information about the chip | |
| creation_date | datetime | Date this object was created | |
| DATE | datetime | UTC date the original data file was saved | |
| DATE_OBS | datetime | UTC date at the start of the observation | |
| EXPTIME | float | Total observation time | sec |
| extension | int | The extension to extract | |
| filename | str | The name of the associated file | |
| filter | Filter | Information about the filter | |
| globalname | str | The name used to store and retrieve file to and from Storage | |
| imstat | Imstat | Image statistics for the frame | |
| instrument | Instrument | Information about the instrument | |
| is_valid | int | Manual/external flag to disqualify bad data (SuperFlag) | |
| LST | float | Local sidereal time at the start of the observation expressed as the number of seconds (a float) since UTC midnight | sec |
| MJD_OBS | float | Modified Julian date at the start of the observation (JD-2400000.5) | day |
| NAXIS1 | int | Length of data in axis 1 | pixel |
| NAXIS2 | int | Length of data in axis 2 | pixel |
| OBJECT | str | Object name | |
| OBSERVER | str | The observer | |
| observing_block | ObservingBlock | Information about the observing block | |
| overscan_x_stat | Imstat | Statistics of the overscan region in the x-direction | |
| overscan_y_stat | Imstat | Statistics of the overscan region in the x-direction | |
| OVSCX | int | Number of overscan pixels in the x direction | pixel |
| OVSCXPRE | int | Number of overscan pixels to skip in the x direction at the edge of the chip | pixel |
| OVSCXPST | int | Number of overscan pixels to skip in the x direction at the edge of the data region | pixel |
| OVSCY | int | Number of overscan pixels in the y direction | pixel |
| OVSCYPRE | int | Number of overscan pixels to skip in the y direction at the edge of the chip | pixel |
| OVSCYPST | int | Number of overscan pixels to skip in the y direction at the edge of the data region | pixel |
| prescan_x_stat | Imstat | Statistics of the prescan region in the x-direction | |
| prescan_y_stat | Imstat | Statistics of the prescan region in the y-direction | |
| process_status | int | A flag indicating the processing status | |
| PRSCX | int | Number of prescan pixels in the x-direction | pixel |
| PRSCXPRE | int | Number of prescan pixels to skip in the x-direction at the edge of the chip | pixel |
| PRSCXPST | int | Number of prescan pixels to skip in the x-direction at the edge of the data region | pixel |
| PRSCY | int | Number of prescan pixels in the y-direction | pixel |
| PRSCYPRE | int | Number of prescan pixels to skip in the y-direction at the edge of the chip | pixel |
| PRSCYPST | int | Number of prescan pixels to skip in the y-direction at the edge of the data region | pixel |
| quality_flags | int | Automatic/internal quality flag | |
| raw_fits_data | RawFitsData | The multi-extension raw image | |
| template | Template | Information about the template | |
| UTC | float | Universal Coordinated Time (UTC) at the start of the observation expressed as the number of seconds (a float) since UTC midnight | sec |
