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The Observation Type is a integer number encoding the kind of observation, and serves to distinguish between calibration and science exposures. The archive recognizes roughly 7 different types of observations; a summary is shown in table . The complete list of current observation types in use can be obtained by using the SHOW command of the query software (section ).
Occasionally, a new entry may be added to the list (for which there is ample possibility), for instance if a new instrument uses a specific kind of calibration exposure. The query software supports a function to search calibrations for a given selection of observations (CALSELECT, see section ), which makes use of the observation-type code.