Comparison of thermal rate coefficients for the DR of ${\mathrm{H}}_2^{+}$and HD⁺. Left panel: DR of ${\mathrm{H}}_2^{+}$. dashed blue and dashed red lines: fits by Galli & Palla (1998) and Stancil et al. (1998), respectively, of the thermal rate coefficient computed by Schneider et al. (1994) (triangles); dash-dotted green line: fit of the rate computed by Coppola et al. (2011) from the cross sections by Takagi (2002); solid black line: thermal rate, this work; dashed black line: Frank-Condon averaged rate, this work. Right panel: same for HD⁺. dashed blue and dashed red lines: extrapolations by Galli & Palla (1998) and Stancil et al. (1998), respectively, of the thermal rate coefficient computed from the experimental cross section by Strömholm et al. (1995) (dots).