X-ray flux, luminosity, and temperature evolution. From upper to lower panel, we show the observed 0.3–1 keV X-ray flux, the 0.3–1 keV intrinsic X-ray luminosity, and the (rest-frame) disc temperature evolution, as derived from our best-fitting DISKBB models to the 11 XMM-Newton pointed observations. The first data point in the upper and middle panels refers to the slew observation whose observed count rate has been converted into X-ray flux and luminosity by using the best-fitting model from the nearest XMM-Newton pointed observation (XMM1). In all panels, the shaded areas highlights the period during which regular (red, XMM3 to XMM5) and irregular (blue, XMM6) QPEs are detected.