Fig. 23.
Residual telescope polarization qtel = Qtel/I and utel = Utel/I as function of parallactic angle for the unpolarized star ϵ Eri in the VBB filter. Also shown are the measurements q +, q −, u +, and u − of a polarimetric cycle, which include instrument polarization component ±pSZ for the P2-mode and a field position angle offset of 60°.
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