Mass-radius relation of the companion of CPD-64°481 (left panel) and PHL 457 (right panel) for different inclinations (filled rectangles), compared to theoretical relations by Chabrier & Baraffe (1997) for an age of the system of 1 Gyr (short dashed line), 5 Gyr (long dashed line) and 10 Gyr (solid line). For all shown solutions mass and radius of the sdB are also consistent with the spectroscopic surface gravity measurement of log g = 5.60 ± 0.05 for CPD-64°481 (Geier et al. 2010) and log g = 5.38 ± 0.05 (Geier et al. 2013a) for PHL 457.