Light curve (upper panel) and HID (lower panel) of J1348 during its 2019 outburst (MAXI data between MJD 58509 and 58634). The small grey dots represent X-ray data, and the coloured symbols mark the interpolated position for each X-shooter epoch. For the HID we only considered data with count rates exceeding 0.025 photons cm⁻² s⁻¹ in each band. The X-ray colour is defined as the ratio between the hard (4–20 keV) and the soft (2–4 keV) count rates. The source displays the classic hysteresis loop in the anticlockwise direction.