Spectral evolution of 2M0918. Top: 0.5–2 keV observed-flux light curve. In all panels, the dashed horizontal line represents the weighted average of the y values. Middle: absorber N_H over time. The red open circles correspond to eRASS 1–3, where the fit did not constrain the column density. XMM-Newton is reported as an upper limit at 90% confidence. A clear anticorrelation with flux is noticeable when N_H is compared with the evolution in the top panel. Bottom: intrinsic flux light curve. eRASS2 was only constrained as an upper limit.