If the exposure time is not specified in an observation request, the exposure time is chosen among the user's standard exposure times using a set of rules which have been previously discussed. Although this may be adequate for many requests, the user may wish to specify the exposure time for a given request in an explicit way. This is done using the exp keyword:

NGC4698; exp=150

This would be interpreted as a request for observations of NGC4698, made by the default user. The observations would be carried out using the default options specified in the default user's profile, except that the exposure time would be 150 sec.

Specifying camera resolution

If the camera resolution is not specified in an observation request, the default camera resolution specified in the user's profile would be used. Although this may be adequate for many requests, the user may wish to specify the camera resolution for a given request in an explicit way. This is done using the high, medium, and high keywords, which refer to binning factors 1, 2, and 3, respectively:

NGC4698; medium

This would be interpreted as a request for observations of NGC4698, made by the default user. The observations would be carried out using the default options specified in the default user's profile, except that the binning factor would be 2.

Specifying frame size

If the frame size is not specified in an observation request, the default frame size specified in the user's profile would be used. Although this may be adequate for many requests, the user may wish to specify the frame size for a given request in an explicit way. This is done using the full and center keywords, whose meaning has been discussed previously:

NGC4698; center

This would be interpreted as a request for observations of NGC4698, made by the default user. The observations would be carried out using the default options specified in the default user's profile, except that center subframes (one-fourth of the detector's area) would be used.

Specifying frame mode

If the frame mode is not specified in an observation request, the default frame mode specified in the user's profile would be used. Although this may be adequate for many requests, the user may wish to specify the frame mode for a given request in an explicit way. This is done using the light and dark keywords, whose meaning has been discussed previously:

NGC4698; dark

This would be interpreted as a request for dark frame(s) taken with the telescope pointed at NGC4698 (of course, the position at which the telescope points when taking dark frames is immaterial, provided it is within the telescope slew limits), made by the default user. The dark frames would be taken using the default options specified in the default user's profile.