Comparison among the WD effective temperatures (bottom) and surface gravities (middle) as well as MS star effective temperatures (top) for 54 WDMS binaries with VOSA reliable two-body fits and spectroscopic parameters derived from SDSS spectra. The black dashed lines indicate the one to one relation, whilst the red dashed lines are linear fits to the data. Note: in the top panel, values above 3700 K in the horizontal axis were not considered.