LAS\WRITE [observation]
Writes the observation in the R buffer onto the output file ; if a
version of this observation is already in the file, a new version of the
observation is created. A new observation number can be specified as
argument. The information written depends on the operations done on the
observation. Existing fit results are written. The calibration
information is written only if the calibration is checked (see SET
CALIBRATION command).