;+
;FUNCTION: data_to_normal
;PURPOSE: convert data coordinates to normal coordinates
;INPUT:
; datav: data coordinates
; s: !AXIS structure
;KEYWORDS:
; none
;
;CREATED BY: Frank Marcoline. Hiested from Davin's normal_to_data.
;LAST MODIFICATION: @(#)data_to_normal.pro 1.2 97/01/09
;
;NOTE: I think this procedure is superceded by convert_coord.
;-
function data_to_normal, datav, s
if s.type eq 0 then return, s.s(1)*datav+s.s(0) $
else return, s.s(1)*alog10(datav)+s.s(0)
end