Results of the PA (left panels) and ellipticity (right panels) measurements on one of the data frames of each system. In the top left corner of each panel, the radius of the masks are given: r is the radius of the circular mask in the PA measurement procedure, r_in and r_out are the inner and outer radii of the elliptical ring mask in the ellipticity measurement procedure. From top to bottom: MG0414+0534, HE0435-1223, RXJ0911+0551, SDSS0924+0219, PG1115+080, SDSS1138+0314, and B1422+231.