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Fig. 4.


Measured and fitted offset of the angle of linear polarization induced by the instrument downstream of M4 as a function of HWP and derotator angle in the H-band. The legend only shows the -values of each data point or curve; it is implicit that the corresponding values for differ 45° from those of . The measurement points and fitted curves for  = 0.00° ,22.50° (blue) and  = 90.00° ,22.50° (green) overlap.

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