Comparison between the SPOTS models and Feiden models at 1 Gyr. Left: the mass–radius relation of non-magnetic and magnetic versions of both SPOTS and Feiden models. Right: same as the left, but detrended against the f_spot = 0.00 SPOTS model. Both magnetic models predict inflation rates of 3%–10%, but the morphology of the mass-dependent inflation percentage differs. Their similarity is encouraging, given the many different choices made in constructing the two isochrones.