From top to bottom, J-band (HAWK-I), B-band (OM), Swift/XRT, and XMM-Newton RGS light curves of PSR J1023. The bin time is 0.5 s for the J-band curve, 10 s for the B-band and the Swift/XRT curves, and 140 s for the XMM-Newton RGS curve. The optical light curve has been de-trended. Errors are reported at the 68% confidence level and are shown for the RGS light curve only. For the HAWK-I, OM, and the Swift/XRT curves, errors (68% confidence level) are of the order of 0.02 mJy, 0.1 mJy, and 0.2 counts s⁻¹, respectively. The top x-axis reports the orbital phases of the system, which have been evaluated starting from the ephemeris of Archibald et al. (2009), phase 0 being the inferior conjunction of the companion star.