Comparison of the R/R_⊙ for the 332 PTPS stars derived here and calculated from the empirical calibration of Alonso et al. (2000). Both relation (top) and differences (bottom) are presented. The uncertainties in our determinations are shown for every target, whereas for Alonso et al. (2000) radii a typical uncertainty for 10 R_⊙ star is denoted in the upper left corner. The solid line presents the one-to-one relation.