Mrk 1018 optical-to-X-ray SED. Top left panel: SED for the bright state. Swift-XRT data are reported in green, those from Swift-UVOT in red, and XMM-OM in blue. The best-fit model for each telescope is reported using the bold lines (in corresponding colors). XMM-Newton data are not shown to avoid overcrowding. Bottom left panel: residuals, expressed in terms of (data-model)/error, for the model described in Sect. 5.1. The horizontal dashed black line indicates the 0-level. Top right panel and bottom right panel: same as in the left panel, but now the data and residuals refers to the faint state. NuSTAR points are given in magenta, while Chandra in black. Y-axis scale is the same for the top panels, allowing for a direct comparison between the two states. The optical/UV points for the faint state are not fitted to the model, as the fit would otherwise be unconstrained. The residuals for the X-ray points are in the range ±5, as shown in the inset panel.