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Recomputing Velocity Information

Although atlod or fits is the best place to set the velocity information, this can also be handled by the task uvredo. This task recomputes a number of the `derived' quantities (such as observatory radial velocity) which are stored in a visibility dataset. You have to select uvredo's velocity option, and set the keyword velocity to indicate the rest frame to be used. Typical inputs are:

UVREDO
vis=line.uv	Input dataset name
out=line2.uv	Output dataset name
options=velocity	Recompute velocity information
velocity=lsr	Use the LSR as the rest frame