| F | fine mode, row sampling 1.5 arcsec, row distance 2.25 arcsec. | |
| N | normal mode, row sampling 3 arcsec, row distance 4.5 arcsec. | |
| Q | quick mode, row sampling 6 arcsec, row distance 9 arcsec. | |
| S | special mode, parametres of measurement are selected depending on purpose of measurement |