Average quv data sets in 4 main telescope pointing blocks for ϵ Aurigae observed with HiVIS on October 23rd 2013. No telescope Mueller matrix calibration has been applied. The input signal is qu as shown by ESPaDOnS observations but the detected HiVIS signature is much larger in v due to the telescope cross-talk. The 4 independent quv spectra show some spectral variation due to changes in the telescope cross-talk as the optics change with time. See text for details.