Albedo test case. Elements of the reduced Stokes vector of photons scattered out of a cloud having spheroidal particles with C_sca,pol = −0.1. Intensity using spheroids with C_sca,pol = 0 is shown as a dashed line. Analytic solutions Eq. (58)) are represented by lines and MCPOL results by symbols. Intensities in black are multiplied by a factor of 11. The rest of the notation is the same as in Fig. 7 and Table A.1.