 Airspace in this class that begins at the default altitude of MSL is not delimited.Class E airspace that begins at AGL is delimited by a broad, shaded magenta border.Airspace in class E that begins at the surface is delimited by a thin, dashed magenta line (this type of class E is most often seen as an extension to class D airspace that facilitates control of IFR routes to and from an airport).