Zoom of the SED of J0948+0022 in the infrared-to-ultraviolet range. Data are from: WISE (filled squares), 2MASS (filled triangles), SDSS (continuous line), Swift/UVOT (filled circles). Left panel: blue refer to lowest observed activity state (LS, 2009 May 15); right panel: red to highest activity state (HS, 2012 December 30). The grey dot-dashed line represents a model of standard accretion disk as expected in the case of J0948+0022 (M = 7.5 × 10⁷ M_⊙); the grey dotted line represents the synchrotron emission; the continuous grey line is the sum of the two models.