Comparison of vertical (top) and radial (bottom) velocities measured in the 6301 line, with (left column) and without (right column) straylight compensation. All structure in the interior penumbra (spines, inter-spines and the intermediate population) were included in the fits. Lines drawn full correspond to COG measurements, short dashes to the line core, and long dashes to the 70% bisector LOS velocities.