Equivalent widths of Hβ and Hα lines measured in the CAFOS spectra of DA WDs and other objects with dominant Balmer lines. The classification of known DA WDs with typical errors of less than about 0.1 subtypes was taken from (1) = Limoges et al. (2015), (2) = Kawka & Vennes (2012), and (36) = Gianninas et al. (2011). Their gravities, given by these authors, varied between 7.6 < log g < 9.0. The objects with the two lowest and highest gravities, CA462 = WD 2246+223, CA384 = WD 1824+040, CA075 = WD 0416+701, CA077 = WD 0457-004, are marked. New DA WDs (and candidates) from Figs. 1 to 4 are also labelled by their CA numbers. The plus signs and crosses connected with solid lines show the measurements of model spectra with T_eff from 7000 K to 26 000 K (below 20 000 K in steps of 1000 K, above 20 000 K in steps of 2000 K) with gravities of log g = 7 and logg = 9.