All Figures

$\begin{figure} \par\includegraphics[width=16cm,clip]{aa0430_fig1.eps} \end{figure}$ Figure 1: Bisectors of Fe I 557.6 nm. We plot an array of bisectors for the limb side and center side penumbra which corresponds to the spatial averages of the small white squares in the image to the right. The intensity level is normalized relative to the line profile between the continuum and the line core level. The bisectors are shown for intensity levels between 2% and 80%. The bisector shift from the reference wavelength is converted into Doppler velocity in units of km s^-1. The upper and lower right bisectors (above and beneath the sunspot image) stem from the spatially averaged line profiles (marked with the black squares in the sunspot image) from the limb and center side, respectively. The white arrow in the umbra points towards disk center. The tickmarks in the image correspond to 1 arcsec.
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In the text

$\begin{figure} \par\includegraphics[width=8.3cm,clip]{aa0430_fig2.eps} \end{figure}$ Figure 2: Bisectors in and around a flow filament: a zoomed-in line wing Doppler map (from bisector intensities between 60% and 80%) is shown in the upper left image for a portion of the center side penumbra (5.4 $\times$ 4.0 arcsec²). The upper right image displays the corresponding continuum intensity map. Along and adjacent to one individual flow filament we display the bisectors, which correspond to the black squares within the images. The squares and the displayed bisectors correspond to $0.2 \times 0.2$ arcsec².
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In the text

$\begin{figure} \par\includegraphics[width=7.8cm,clip]{aa0430_fig3.eps}\end{figure}$ Figure 3: Sketch illustrating how downflows influence the shape of the bisector. On the center side the bisectors are blue-shifted by the Evershed flow. A deep-lying downflow adds a red-shift (at high intensity levels) to the blue-shifted bisector, leading to a reversal (left panel) or at least to a bisector "kink towards the red''. On the limb side the bisectors are red-shifted by the Evershed flow. A deep-lying downflow adds a red-shift (at high intensity levels), leading to a "kink'' towards higher red-shifts in the bisector.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{aa0430_fig4.eps}\end{figure}$ Figure 4: Synthetic bisectors with different slopes: the upper and lower left panel show the LOS velocities of a flow channel in the deep photosphere for the limb and center side, respectively. The flow has an absolute velocity of 8 km s^-1 and a downward angle with respect to the horizontal of 5 $^\circ$ . The solid line traces the flow component, while the dotted line reflects the background component at rest. The right panels show the corresponding synthetic bisectors for a macro-turbulence of 1 km s^-1 (top) and 2 km s^-1(bottom). The red-shifted (thick) solid lines correspond to the limb side bisectors and the blue shifted (thin) solid lines correspond the the center side bisector. For better comparison with the limb side bisector, the dotted line represents a reflection of the center side bisector.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{aa0430_fig5.eps}\end{figure}$ Figure 5: Synthetic bisector exhibiting kinks: for a flow configuration described in the text, the left panels displayes the velocity component along the LOS for the limb (top) and center side (bottom). The right panel displays the corresponding synthetic bisectors (top), and the line profiles (bottom). Thick solid, thin solid, and dotted lines as in Fig. 4.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{aa0430_fig5.eps}\end{figure}$	Figure 5: Synthetic bisector exhibiting kinks: for a flow configuration described in the text, the left panels displayes the velocity component along the LOS for the limb (top) and center side (bottom). The right panel displays the corresponding synthetic bisectors (top), and the line profiles (bottom). Thick solid, thin solid, and dotted lines as in Fig. 4.
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