| name | type | description |
| fFieldMask | F | Returns mask value for a given name (e.g. 'seeing') |
| fFieldMaskN | F | Returns description of mask value (e.g. 'SEEING PSF') |
| name | value | description |
| SEEING | 0x00000001 | |
| TRACKING | 0x00000002 | |
| PSF | 0x00000004 | |
| PHOTOMETRY | 0x00000008 | |
| PHOTO_DROPOUT | 0x00000010 | |
| ODD_EVEN_DROPOUT | 0x00000020 | |
| SKY_U | 0x00000040 | |
| SKY_G | 0x00000080 | |
| SKY_R | 0x00000100 | |
| SKY_I | 0x00000200 | |
| SKY_Z | 0x00000400 | |
| AMP_U0 | 0x00000800 | |
| AMP_U1 | 0x00001000 | |
| AMP_G0 | 0x00002000 | |
| AMP_G1 | 0x00004000 | |
| AMP_R0 | 0x00008000 | |
| AMP_R1 | 0x00010000 | |
| AMP_I0 | 0x00020000 | |
| AMP_I1 | 0x00040000 | |
| AMP_Z0 | 0x00080000 | |
| AMP_Z1 | 0x00100000 | |
| MANUAL | 0x00200000 |