XMM-Newton RGS1 spectrum taken on 2021d55.6 compared to 2006 spectra scaled with the pure absorption model (left column in Fig. 9). The lower panels show details, and although the 2021d55.6 spectrum has a lot of gaps, one can see that the same-epoch 2006 spectrum (blue) contains much weaker absorption lines, while on the sub-Å level, there is a greater resemblance to the 2006d39.7 spectrum.