Fit of the B&C old stellar population galaxy model to the sources 1049+384 (left) and 1136+420 (right), for different redshifts. Two of the lines are marked with z_sp and z_ph; the two intermediate lines represent the two z_ph2. In 1049+384 the dash-dotted line (marked with z_emp, for empirical) gives the best χ² of all and corresponds to z = 0.05. In 1136+420 a blind fit would provide z ~ 0.45 i.e. identical to z_ph and it is not plotted.