SECTION./ECHE
BACKGROUND/ECHELLE in out [radx,rady,step] [degree] [smooth] [method] [bkgmea]
	estimate interorder scattered light  of an echelle spectrum
SECTION./SMOO
BACKGROUND/SMOOTH   input   output   [radx,rady] [niter] [visu]
	estimate interorder scattered light of an echelle spectrum
