a: three-year running mean of F_10.7 (black) and the YSK model reconstruction of this facular index from the S_A (red), S_N1 (green), S_N2 (blue), S_G1 (purple), and S_G2 (cyan). b: residual between the observed and reconstructed time series, normalised to the change in the former between the 2000 solar cycle maximum and 2008 minimum (Eq. (7)). The dashed lines mark the 10% bound. c–j: The corresponding plots for the F_CaIIK, F_Lα, F_MgII and F_ϕ.