Left: dust-to-gas mass ratios in the stripped tails of NGC 4430, NGC 4522, and NGC 4654 as a function of the galaxy stellar mass for several values of dust temperature (colour bar). Grey dots (grey triangles) represent the dust-to-gas mass ratio if the stripped dust has a temperature of T = 20 K and M_H2/M_HI = 1 (M_H2/M_HI = 0, i.e. no H₂ contribution in the tails). The error bars are dominated by the uncertainties on the FIR flux estimates. The dash-dotted line shows the measured values of the dust-to-gas ratios as a function of mass as measured in Virgo galaxies (Cortese et al. 2016; we plotted the case with a varying CO-to-H₂ conversion factor). Right: same as left panel, however this time the dust-to-gas ratios are a function of the mean galaxy metallicity. The arrow plots the relation as a function of the outer galaxy metallicity (see text for further details). The dash-dotted line traces the expected dust-to-gas ratio metallicity relation for local late type galaxies with the shaded area tracing one standard deviation in a given metallicity bin (Moustakas et al. 2010; Hughes et al. 2013).