The user may omit a data record from within a data category if the information contained on the data record is not relevant to his application. This is quite common when running Aqwa programs.

Some data records cannot be meaningfully omitted, for example, the frequency data record (defining the frequencies to be analyzed) in Data Category 6. (If the user does omit this data record, the program will assume zero frequencies to be analyzed and will terminate normally without actually doing anything!)

The user should note that if a data record is omitted, the program may automatically supply default values for all the quantities associated with that data record. The user may therefore use this mechanism as a default facility (but see Default Values below).