SECTION./ECHE
EXTR/ECH input output [params] [method]
	extract echelle orders
SECTION./OPTI
EXTR/OPT input output  slit,ord1,ord2  [ron,g,sigma] [table] [coeffs] [calc]
	 weigthed extraction of echelle orders
SECTION./ORDE
EXTRACT/ORDER  inp out sl,ang,off meth table coeff [ord1,ord2]
	Extract echelle orders and produces a frame in space pixel-order
SECTION./SKY
EXTRACT/SKY  in out [mode]
	Extracts sky spectrum.
