Mass/radius data for eclipsing binaries with masses below 1 M_⊙. For main-ssequence binaries only those with M and R uncertainties below 3% were chosen from Torres & Ribas (2002); Ribas (2003); Shkolnik et al. (2008); Irwin et al. (2009); Morales et al. (2009a,b); Różyczka et al. (2009); Torres et al. (2010). Data for evolved (t ≳ 10 Gyr) systems were taken from: Popper et al. (1986); Popper (1994); Kałużny et al. (2007, 2008); Thompson et al. (2001, 2010); Lacy et al. (2005). Pre-main-sequence systems data were taken from: Irwin et al. (2007); Stassun et al. (2007, 2008); Çakırlı et al. (2009); Çakırlı & İbanoǧlu (2010). The BCAH98 model for t = 1 Gyr and Z = 0.02, which ends for 0.6 M_⊙ (thick solid line), is suplemented by a CB97 isochrone, available for masses below 0.8 M_⊙ (thin line).