;+
;
; NAME: 
;       DELTA_CONTROL
;
; PURPOSE:
;
;
; CATEGORY:
;       BATSE
;
; CALLING SEQUENCE:
;
;
; CALLS:
;	none
;
; INPUTS:
;       none explicit, only through commons;
;
; OPTIONAL INPUTS:
;	none
;
; OUTPUTS:
;       none explicit, only through commons;
;
; OPTIONAL OUTPUTS:
;	none
;
; KEYWORDS:
;	none
; COMMON BLOCKS:
;	none
;
; SIDE EFFECTS:
;	none
;
; RESTRICTIONS:
;	none
;
; PROCEDURE:
;	none
;
; MODIFICATION HISTORY:
;
;-
function delta_control, x

common delta_control_com, control
control = fcheck(x, fcheck(control, 1))

return, control
end