FUNCTION amie_getMaster, sFilename
;+
; NAME:
;   amie_getMaster
;
; PURPOSE:
;   
;
; CATEGORY:
;   AMIE Calibration
;
; CALLING SEQUENCE:
;   amie_getMaster, sFilename
;
; INPUTS:
;   sFilename - Master data file name 
;
; OPTIONAL INPUT PARAMETERS:
;   None.
;
; OUTPUTS:
;    a float variable array containing the master frame data read from the file
;
; COMMON BLOCKS:
;   None.
;
; SIDE EFFECTS:
;   Hopefully none.
;
; RESTRICTIONS:
;   No restrictions
;
; MODIFICATION HISTORY:
;    2008 Jan 08, sm: First version
;
;    (c) 2008, Santa Martinez, ESA/SCI-OS
;-

  ; Open file and jump over the first 4 bytes
  OPENR, iUnit, sFilename, /GET_LUN
  POINT_LUN, iUnit, 4
  
  ; Define a variable into which the image will be read
  fMasterData=FLTARR(1024, 1024) 
 
  ; Read the data
  READU, iUnit, fMasterData
  
  FREE_LUN, iUnit
  RETURN, fMasterData

END