Tully-Fisher relation for 7 of our rotationally supported dEs (in dark blue), the dEs from van Zee et al. (2004a,b, VZ04, in light blue), the normal spirals from Giovanelli et al. (1997b, G97, in grey) and De Rijcke et al. (2007, DR07, red limited area). Absolute magnitudes of dEs have been obtained using distances from Mei et al. (2007) (criterion described in Table 6). For Giovanelli et al. data we use H0 = 73 km s-1 Mpc-1 (Mei et al. 2007). The arrows indicate lower limits of vmax (those obtained in the inner 6′′). Fits of the Tully-Fisher relation are indicated in black for the normal spirals of Giovanelli et al. (1997b) and in red for De Rijcke et al. (2007, DR07). DR07 fit has been transformed to I band using the colour-morphology relation from Fukugita et al. (1995) and using H0 = 73 km s-1 Mpc-1 and MI ⊙ = 4.08 and MB ⊙ = 5.48 from Binney & Merrifield (1998).
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