18.10 FIT

[CLEAN\]FIT [Plane] | [CHANNEL First Last] [FIELD First Last] [/THRESHOLD Value] [/JVM_FACTOR [NoCircle]]

Fit the dirty beam to obtain the clean beam parameters.

For single fields, the Plane argument can be used to fit just one of the possible Frequency dependent beam planes. Note that the number of beam planes can be different from that of image channels.

For mosaics, dirty beams can be up to 4-D, depending on Frequency and Field number. Keywords CHANNEL (or equivalently PLANE) and FIELD allow to restrict the fit to the specified range of Channels or Field numbers. All ranges are considered

Note that an automatic FIT is performed by all CLEAN algorithms when needed. The appropriate Frequency plane corresponding to each image channel is used. For mosaics, CLEAN takes the average of the fitted beam parameters on all fields.

User specified values can be used instead (see HELP FIT FixedValues).