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Clean beam parameters can also be specified by the users, by loading the BEAM_SIZE array with values other than its default values (0,0,0). In this case, no automatic fit will be performed.
In general, we discourage this usage, as it may result in a very improper flux scaling if the beam size is inappropriate. This mode should be reserved to special cases where the beam cannot be properly fitted, or to have a circular beam by taking as beam size the geometrical mean of the fitted major and minor sizes.
Fixing the beam size should be associated to the FIT /JVM command to minimize (but not suppress !...) errors in total flux scaling.