Left: comparison, for a distance smaller than the emitter size, of the γγ absorption on the BLR photon field computed by agnpy (red solid line) against the results in Finke (2016) (black dashed line). Right: comparison, for a distance much larger than the emitter size, of the opacity obtained with the full calculation using the BLR energy density (solid red line) against the calculation approximating the target with a monochromatic point source (black dashed line). To make the opacity for the point-source non null a viewing angle of θ_s = 20° is assumed. The bottom panels display the deviation of agnpy from the reference (or the approximation). Frequencies are given in the observer reference frame.