Top row, left: mass relative errors as a function of the true mass of the stars, without δν in the observational constraints (blue solid line), or adopting δν with observational errors of 5% and 2% (purple dashed line and green dot-dashed line). The lines show the 1σ error envelope. Right: same as in the left panel, but as a function of the stellar relative age. Bottom row: same as in the top row, but for radius estimates.