Multi-wavelength light curves for the observing campaign on 4C +71.07. Panel a: GASP-WEBT 5 GHz (black cross), 37 GHz (blue triangles), 86 GHz (red diamonds), and 228 GHz (green squares) data [Jy]. Panels b–h: K, H, J, I, R, V, B bands (open circles, [mJy]). Panels g–l: Swift/UVOT v, b, u, w1, m2, w2 bands (coloured discs, [mJy]). Panel m: Swift/XRT observed 0.3–10 keV flux [10⁻¹¹ erg cm⁻² s⁻¹]. Panel n: AGILE/GRID (blue circles) and Fermi/LAT (red squares) data (E >  100 MeV, [10⁻⁶ photons cm⁻² s⁻¹]). The grey dashed areas mark the time-interval (F1, MJD 57321.0–57327.0; F2, MJD 57333.0–57339.0) used to accumulate the almost-simultaneous SEDs (orange (AGILE)/green (Fermi) and black(AGILE)/purple (Fermi) symbols, respectively) shown in Fig. 4.