Example of forward lensing (Rizzo et al. 2018) of a background homogeneous cone with radius of 8 pixels and aperture of 60° (left) into the respective lensed image (right). In both images, the orange stars, red and black ‘+’ indicate, respectively, the position of the cone origin, of the emission peak observed by SINFONI, and of the lens centre. The dashed and solid red circumferences in the right panel have a radius equal to the intrinsic size of the cone in the source plane (i.e., 8 pixel in the example shown here) and to the maximum extent reached by the [O III] emission observed by SINFONI, i.e., R_max = 9.5 pixels; both circumferences are centred in the observed emission peak (red ‘+’). The dashed and dotted black lines identify the position angle (∼130°) and the aperture (here 60°) of the intrinsic cone. We note that the conical source does not intercept the centre of the lens, thus subject to a low magnification.