The red continuum, 6300–7400 Å, in the q–u plane for Epochs 1–4. There is an indication of axial symmetry in the Epoch 2 polarization, pointing in a different direction than seen in Epoch 1. Dashed lines show linear fits to the data points. The Epoch 4 data are not aligned with the origin, likely due to using a constant rather than an actual Serkowski function when performing ISP subtraction.