| SM | standard measurement | |
| LA | long area (width more than 800 arcsec, height less than 600 arcsec.) | |
| BA | big area (width more than 800 arcsec, height more than 600 arcsec.) | |
| RL | repeated measurement of one row (time evolution of this row) | |
| RA | repeated measurement of one area (spec. mode for 5 mins oscilation correction) |