Figure 1. Model fitting on 4 events.

A. Men 400m hurdles (T&F) fitting (R²i = 0.77; R² _ii = 0.91), progressing event. B. Men long jump (T&F) (R² _i = 0.22; R² _ii = 0.55; R² _iii = 0.81), “halted” event since 2001.5 (Table S1). C. Women 100m back (swimming) (R² _i = 0.90; R² _ii = 0.63). D. Men 1500m freestyle (swimming) (R² _i = 0.92; R² _ii = 0.31). Fewer data are available in swimming (C, D) between 1963 and 1977. Prior to the MRCOI, C was in progression and D was a “halted” event since 1991.9. A new progression trend appears after the MRCOI (2000 (C)/1999 (D)) for swimming events, as a result of the introduction of swimsuits.