Renormalization of the beam. The black stars show the beam azimuthal profile template used to renormalize the data. The pointing information of the scan is reflected through the values of the planet scan’s template, since the two-dimensional scanning reference beam map is interpolated to the transit pointing before the azimuthal averaging. The renormalization convention is arbitrary, and is chosen so that the template resulting from uniform azimuthal coverage is set to the value 1 at 1′ from the beam centroid. The blue curve traces the positive data from the planet scan azimuthal average after the renormalization procedure; the yellow dashed curve shows the negative data converted to positive values for plotting purposes. For Jupiter, only data below the conservative threshold are used in the renormalization procedure (see Table B.1) to avoid biases from the finite planetary disc size and detector’s nonlinearity response effects.