Gas mass-loss rate log(Ṁ_g) as a function of K − [22] of the collection of AGB stars in Table A.2. The data of Mira stars are plotted as different symbols according to their spectral type, see the legend in the lower right corner of the diagram. SRVs from Olofsson et al. (2002) are plotted as black crosses; they are all of spectral type M. Stars to the lower right of the black dashed line as well as stars redder than K − [22]=7.5 have been excluded from the ordinary least-squares fit that is shown as the black solid line. The dash-dotted lines show the fit moved up and down by the estimated factor-of-3 uncertainty (Ramstedt et al. 2008).