Test cases 1 through 3 using the spheroid-like Müller matrix (Eq. (46)) with the assumed particle orientation along the z-axis. The different rows show the intensity (top row), linear polarization degree (middle row), and polarization angle (bottom row) of the observed radiation. The analytical solution is shown in black and the model results in orange. The bottom panels present the absolute differences (blue) and relative differences (shaded area) between the analytic solution and the model. The magnitude of the shaded area is given in every panel.