Comparison of spectra calculated by T-matrix formalism (blue and yellow) and FDTD (red and purple) for spheroidal particles with axis ratio 1:1.4 and radius r = 0.75μm, showing spectral features due to material anisotropy. Grey line: mean of 23 measured ISO-SWS spectra. Purple line: average of nine FDTD spectra of the start- and endposition of each setup. Yellow line: 1/3–2/3-approximation of orientation-averaged spectra for two isotropic materials. Red line: average of the FDTD spectra (two of the three spectra are identical) calculated for the c-axis oriented parallel to the particle rotation axis. Blue line: the same for TM spectra