Ratio of literature to calibration radius R^lit/R^* of the stars vs. orbital period for the 19 SB2s where a literature radius is available (Table D.2). For each SB2 the vertical dotted line connects the primary and secondary. Unity is marked by the horizontal solid line, and the average and its standard deviation by the horizontal long-dashed and dash-dotted lines, respectively. The blue three-dot-dashed line is an ordinary least-squares fit (log Y vs. log X) of the primary data.