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freqselmanager.velocity - Function

	Package	synthesis
	Module	map
	Tool	freqselmanager

Create a freqsel data item representing velocity selection

Synopsis
velocity(frame, nchan, mstart, mstep)

Arguments

frame		Reference frame
		Allowed:	String
		Default:	LSR
nchan		No. of velocity channels
		Allowed:	Int
		Default:	1
mstart		Start velocity (e.g. '20km/s')
		Allowed:	Quantity
		Default:	'0km/s'
mstep		Step velocity (e.g. '20km/s')
		Allowed:	Quantity
		Default:	'0km/s'

Returns
freqsel data item
or fail

Description

This function creates a freqsel data item representing selection by velocity.

Example

myfq:= freqselmanager();
item2 := myfq.velocity(nchan=1, mstart='10km/s', mstep='5km/s');

Create a freqsel data item item2 representing LSR velocity selection covering the range 10-15 km/s.