Four examples of alternative morphologies for the source galaxy. Top left: a spiral galaxy composed exclusively of spiral arms, with a clump fraction Q = 80%; top right: an elliptical-like galaxy with a single ellipsoidal component, and Q = 80%; bottom left: a spiral galaxy including both spiral arms and a central spheroidal bulge, with Q = 1%; bottom right: a spiral galaxy composed of an exponential disk and a central spheroidal bulge, with Q = 90%. All models are shown at an angular resolution of 0.25 mas/pixel