FUNCTION TimeScale, t, t0=t0, tu=tu
;+
; NAME:
;	TimeScale
; PURPOSE:
;	Returns range of time axis to data units established by
;	a previous call to href=TimeXAxis=
; CATEGORY:
;	Telling time
; CALLING SEQUENCE:
;	R = TimeScale(t)
; INPUTS:
;	t		array; type: time structure
;				time array to be converted to data units
; OPTIONAL INPUT PARAMETERS:
; OUTPUTS:
;	R		array; type: float
;				times converted to data units
; INCLUDE:
	@compile_opt.pro			; On error, return to caller
; CALLS:
;	TimeOp
; COMMON BLOCKS:
	common TimeScale, torigin, trange, tunit, texact
; PROCEDURE:
; >	The common block is set by a call to href=TimeXAxis=.
; MODIFICATION HISTORY:
;	JULY-2001, Paul Hick (UCSD/CASS; pphick@ucsd.edu)
;-

t0 = torigin
tu = tunit

RETURN, TimeOp(/subtract, t, torigin, tunit)  &  END