517591.fig.004a
(a)
517591.fig.004b
(b)
517591.fig.004c
(c)
Figure 4: The position of the vortex points (expressed in pixel number) as measured without the wedge (circles) and with the wedge (crosses), (a) wedge inserted horizontally, (b) wedge inserted at , (c) wedge inserted vertically as presented in the right corners. Deflection angle  arcsec.