(a) The Montillet et al. (2022) TSI composite (black dots for daily values and thick yellow line for 180-day running means) over-plotted on the updated SATIRE-S TSI composite (red dots for daily values and thick blue line for 180-day running means). (b)–(f) Difference between various composites of measured TSI (as denoted in the legend) and the updated SATIRE-S reconstructed TSI composite. Daily values are represented by red dots and 180-day running means by the thick blue line. The dashed yellow lines are linear fits to the residuals. The RMS differences, linear correlation coefficients, and the trend of the residuals are given in each panel. The dotted black line marks residuals of 0 Wm⁻². The right panel shows the histogram of the residuals in bins of 0.05 Wm⁻².