| 301 USER NUMBER | A unique user identifier |
| 302 USER TO PA SEQUENCE NUMBER | Used to verify reception of all files |
| 303 JD OF REQUEST | JD + Fraction when file was generated |
| 304 USER MAILING ADDRESS | For PA to User mail contact |
| 305 USER BILLING ADDRESS | For use on contract operated instruments |
| 306 USER TELEPHONE NUMBER | For PA to User voice contact |
| 307 USER EMAIL ADDRESS | For PA to User Email contact |
| 308 USER MODEM NUMBER | For PA to User dial-up modem contact |
| 309 USER INTERNET ADDRESS & PATH | For direct PA to user File transfer |
| 310 OBSERVE GROUP BY PHASE | Set period, start & end phase, density |
| 311 OBSERVE GROUP PERIODIC | Set frequency, density, and scatter |
| 312 OBSERVE GROUP LOG RANDOM | Set minimum time, distribution |
| 313 OBSERVE GROUP TIME WINDOW | Set JD,LST,UT |
| 314 OBSERVE IF SEM | Check Standard Error of Mean of observation. |
| 315 OBSERVE IF DELTA MAGNITUDE | Check differential magnitude of observation. |
| 316 OBSERVE IF SEEING | Check seeing conditions in guide camera. |
| 317 MAX NUMBER OF OBSERVATIONS | Quit Observing if sufficient data |
| 318-319 | NOT ASSIGNED (see note) |
| 320 FORM A GROUP | Generate a group from previous statements |
| 321 RETURN DATA FORMAT | Request reduced or raw data |
| 322-329 | NOT ASSIGNED |
| 330 OBSERVING SEQUENCE | Set sequences of objects and FDIs |
| 331 FDI SEQUENCE | Filters, detectors, & Integration Time |
| 332-339 | RESERVED |
| 340 DEFINE GOALS OBJECT | Define group using the 100 series statements |
| 341 END GOALS OBJECT | Set the end of a 340 statement |