Evolutionary sequences of low-mass WDs with different thicknesses of the H envelope (canonical and thin) in the log (g) vs. T_eff plane. The vertical black line to the left (right) connects points of equal age, 13.7 Gyr, for the canonical (thin H envelopes) tracks. The dashed lines also correspond to the galactic disk age limit, and are only marked as projections to delimit the region. We have also included the 0.130 and 0.140 M_⊙ artificial evolutionary sequences. Also included are the observed ELMs and ELMVs. The progenitor considered has M_⋆ = 1.5 M_⊙.