Table 3: Diffusion timescales $\tau _{\rm D}$, mass fraction at the layer of diffusion, $\log q $, and the accretion rates $\dot{M}$ in $M\sb {\odot }$/yr for 38 DAZs abundances.

Object		 $\log\tau_{\rm D}$ $M_{\rm WD}$ $\log q $ $\log\dot{M}$

WD0032-175		 2.72 0.600 -10.04 -17.84
HS0047+1903 -1.48 0.512 -15.56 -14.83
HE0106-3253 -1.82 0.616 -15.90 -14.45
WD0208+296 3.78 0.537 -8.43 -15.64
WD0235+064 -1.04 0.550 -14.91 -17.69
WD0243-026 3.39 0.719 -8.67 -16.37
WD0245+541 4.47 0.712 -6.98 -17.66
HS0307+0746 1.81 0.664 -11.42 -14.87
WD0408-041 -1.56 0.506 -15.70 -15.39
WD0543+579 3.22 0.597 -9.17 -17.48
WD0846+346 3.51 0.595 -8.72 -16.22
WD1015+161 -1.59 0.571 -15.60 -14.51
WD1102-183 3.27 0.597 -9.10 -17.25
WD1116+026 -1.73 0.552 -15.86 -15.24
WD1124-293 2.29 0.663 -10.66 -15.69
WD1150-153 -1.63 0.500 -15.79 -14.82
WD1202-232 2.59 0.724 -9.900 -16.79
WD1204-136 -0.34 0.606 -14.01 -15.44
WD1208+576 4.50 0.530 -7.31 -17.25
HE1225+0038 2.48 0.662 -10.31 -17.03
WD1257+278 3.26 0.541 -9.25 -15.24
HE1315-1105 2.02 0.857 -10.63 -16.47
WD1337+705 -1.57 0.574 -15.56 -15.29
WD1344+106 3.68 0.594 -8.46 -18.02
WD1407+425 2.27 0.602 -10.83 -17.48
WD1455+298 4.33 0.386 -7.98 -16.38
WD1457-086 -1.73 0.628 -15.71 -14.64
WD1614+160 -1.46 0.514 -15.53 -15.91
WD1633+433 3.69 0.654 -8.34 -15.17
WD1821-131 2.89 0.853 -9.21 -17.43
WD1826-045 2.58 0.661 -10.11 -15.83
WD1858+393 2.58 0.601 -10.30 -15.27
WD2115-560 2.29 0.663 -10.66 -15.09
HS2132+0941 -1.47 0.454 -15.63 -15.97
WD2149+021 -1.62 0.565 -15.68 -16.37
HE2221-1630 1.84 0.727 -11.28 -14.82
HS2229+2335 -1.60 0.569 -15.62 -14.53
WD2326+049 -1.70 0.551 -15.81 -15.13


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