Binned Q (top two rows), U (middle two rows), and P maps (bottom two rows) after correction for median Q0, U0 values (top) and after correction of instrumental field polarization from paraboloid fits of Sect. 4 (bottom) for standard star fields of (a) WD-2149+021 at Modified Julian Date (MJD) of 57919 in B band, (b) Vela1 at MJD = 57845 in V band, (c) WD-1344+106 at MJD = 58278 in R band, and (d) WD-0752-676 at MJD = 57846 in I band.
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