Inner rotation curve as traced by the peak velocities at high resolution (filled squares in blue in the online version), and at low resolution (filled dots in red in the online version). The CO data are shown with star symbols (in green in the online version). The open square symbols (in red in the online version) are for rotational velocities as traced by the moment-1 map. For each curve the weighted mean velocities between that relative to deconvolution model-shape and model-mean are used.