Schematic representation of the expected effects of disk thickness. Left: effect of ring vertical thickness on the azimuthal profiles of a radially narrow, optically thin ring. A vertically thin ring (dark) shows no variation in its azimuthal profile along the ring, while a thick ring (green) displays strong azimuthal variation along the ring. Right: effect of disk vertical thickness on the minor axis brightness of a disk at the location of a gap (right). A vertically thin gapped disk (dark) shows deep gap along the minor axis, while a thick gapped disk (green) displays shallow gap along the minor axis direction.