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(a, b) A detailed and coarser map of the ellipticity, ρ, with overlaying waveplate combinations that provide linearly (mean: black lines, ±3std: dashed lines) and circularly (mean: black circles, ±3std: intervals) polarized light. To illustrate the accuracy smaller regions of interest (a, white rectangles) were measured in more detail (c, d, e). The overlapping plots are based on the fitting of the original map (a), and have an ellipticity of ρ = 0.29 (c), ρ = 0.12 (d) and ρ = 0.86 (e).
