Fig. 4.— LOS stellar dispersion data from Bottema (1989) in red. The black curve shows an exponential + inverse Gaussian (Eq. 4) fit to the data. The fitting parameters are given by σ$_{0}$ = 59 . 5 ± 8 . 4 km s − $^{1}$, R$_{σ}$ = 1 . 16 ± 0 . 29 kpc, A = 0 . 59 ± 0 . 06 and B = 0 . 12 ± 0 . 02 kpc. The data have not been corrected for inclination. 38