Top: Comparison between the reconstructed Lyman-α irradiance from SATIRE-S (orange) and the Machol et al. (2019) composite (black). Shown are 81-day running means. The series are shown without any adjustment. Bottom: Comparison between the reconstructed Mg II irradiance from SATIRE-S (orange) and the IUP Mg II core-to-wing composite (Viereck et al. 2001, black for version 20250204 and ciel for version 20240603). Our Mg II irradiance has been linearly scaled to match the IUP Mg II index (see Sect. 5). The numbers in the lower part of the figures denote the conventional solar cycle numbering.