Core intensity of the 525.0 nm line for the different viewing angles considered in the 2D FS geometry. Viewing angles and μ = cosγ are given in the text labels. In a FS, rays with the same μ (dotted, dashed) do not necessarily have similar intensities. The hot walls are more clearly seen for larger azimuthal angles χ. Note that the location of the maximum intensity in x is – for inclined rays – somewhat arbitrary as the outgoing intensity is plotted at the top of the atmosphere.