title: Diffraction efficiency of echelles working in extremely high orders.
abstract: Aproposal to use a high-angle echelle in the vacuum UV in the 350th order triggered a theoretical study to determine if there were unusual obstacles to success. No serious obstacles were found except for efficiency limitations.
authors.forename: E
authors.initials: E
authors.lastname: Loewen
authors.forename: D
authors.initials: D
authors.lastname: Maystre
authors.forename: E
authors.initials: E
authors.lastname: Popov
authors.forename: L
authors.initials: L
authors.lastname: Tsonev