Relative semimajor axis of DE0630−18 obtained from two estimators using the mass-luminosity-age relationships according to BT-Settl (black curves) for ages of 1 Gyr (dashed), 3 Gyr (solid), and 7 Gyr (dotted) and DUSTY (thick grey curves) for ages of 1 Gyr (dashed) and 5 Gyr (solid). The secondary mass increases from 0.050M_⊙ to 0.076 M_⊙ upwards along every curve. Allowed values are marked with open and filled circles.