CV WD masses from Ritter & Kolb (2003,V7.14) and Savoury et al. (2011), excluding systems with no published uncertainty in Mwd, and GK Per, for which only a lower limit Mwd ≥ 0.87 ± 0.24 M⊙ has been determined. Systems shown as solid symbols are our “fiducial” sub-sample (Table 1). The dotted horizontal line indicates the division between C/O-core WDs (above) and He-core WDs (below), while the dotted vertical lines show the position of the orbital-period gap.
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