Note: IRCAL Polarimetry mode is still undergoing development! ... During the day, install the waveplate on IRCAL. ... At start of night, take polarized flats on the sky, with the waveplate and Wollaston already in place. ... This should be done in polarimetry mode, through the waveplate and wollaston, but you don't need to bother with running the polarim script - just take some images. ... First, take regular IRCAL sky flats, most easily done with the "getflats" script. ...