Example of RC fitting. The blue squares indicate the observed rotation velocities as a function of the position along the spatial axis of the spectrum (in pix). The black line depicts the best-fit synthetic RC to these data points. From the best-fit parameters (here Vmax = 118 km s-1, rt = 4.1 pix) we can infer the intrinsic shape of the RC (in red). Here the x-axis is the galactocentric radius (in kpc) (here , , z = 0.17, ). Geometric and observational effects lower the observed rotation velocities.
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