From top to bottom: as a function of S_A cycle amplitude, the cycle amplitude of (a) the effect of faculae and network (red), and (b) of sunspots on TSI (blue), (c) the ratio of the two (green), and (d) TSI (black). That is, A(FB), |A(SD)|, A(FB)/|A(SD)|, and A(TSI)-versus-A(S_A). The plot points and error bars represent the mean of the values from the three TSI models and the associated 1σ uncertainty (see Sect. 4.3). The latter is omitted in the case of A(FB) and A(SD), where it is so minute as to be obscured by the plot points. The values from the individual TSI models, lying within 1σ of the mean, are not drawn to avoid cluttering. The S_A and PSI time series on which the TSI models are based, and therefore the plot points, cover solar cycles 12 to 24. The A(TSI) plot points corresponding to solar cycles 22 and 23 are labelled. The lines correspond to the linear or quadratic polynomial fit.