Power-law (tbabs*zpowerlaw, top row) and double blackbody (tbabs*(zbbody+zbbody), bottom row) model fits to the convolved eROSITA spectra (eRASS2, left column; eRASS3, middle; eRASS4, right), with J2344 being observed in eRASS2, eRASS3 and eRASS4 at 10, 192 and 378 days after optical peak. The black and grey markers represent source and scaled background spectra. The solid red line denotes the median model, whilst the shaded red band encloses 68% of the posterior, and the gold line denotes the median background model fit. Spectra are re-binned to minimum 10 counts per bin for plotting purpose only. The preferred model fit for the eRASS2 spectrum is the double blackbody model, whereas the power-law model is preferred for the eRASS3 and eRASS4 spectra.