All Figures

$\begin{figure} \includegraphics[width=12cm,clip]{2509fig1.eps} \end{figure}$ Figure 1: The map obtained on 7 December 2003 in Fe I 6302.5 Å and composed of 3 superimposed layers. The bottom layer is the H $\alpha$ image; the colored layer displays the longitudinal field, saturated inside the spot, where the maximum field is $3\times 613$ Gauss; the dash layer displays the transverse field, unresolved in orientation due to the fundamental ambiguity. The white arrows point to parasitic polarities at the filament feet. The letters from A to H localize the 8 points where the UNNOFIT inversion code has been applied to test our magnetic field diagnostic method.
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In the text

$\begin{figure} \par\includegraphics[width=10cm]{2509fig2.eps} \end{figure}$ Figure 2: Logarithmic map of the same region as in Fig. 1, i.e. the plotted field strength is $\log \left( 1+\left\vert B_{//}\right\vert \right)$ , to which the sign of the longitudinal field B_// is given (white for positive, black for negative). The black arrows point to the parasitic polarities at the filament feet and white arrows to some of the weak opposite polarity regular patterns that are also visible in Fe I 6301.5 Å.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2509fig3a.eps}\par\includegraphics[width=8.8cm,clip]{2509fig3b.eps} \end{figure}$ Figure 3: For detailed comparison, longitudinal magnetic field ( top) and transverse magnetic field intensity ( bottom) of the central third of the map (not corrected for anamorphosis). Each detail of the longitudinal field map corresponds to a detail with same shape on the transverse field map.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{2509fig4.eps} \end{figure}$ Figure 4: Correlation between the transverse field $B_{\rm perp}$ and the longitudinal field $B_{\rm par}$ , for the central third of the map where the filament lies, thus avoiding the spot. No $B_{\rm par}$ is found without a $B_{\rm perp}$ contribution and vice versa, resulting in a non-vertical field. The noise level in the determination is 5-10 Gauss for $B_{\rm par}$ and 50-100 Gauss for $B_{\rm perp}$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{2509fig5.eps} \end{figure}$ Figure 5: Histogram of the the inclination angle with respect to line-of-sight in the central third of the map (the filament zone). Only the points where field strength $B_{\rm tot}$ is larger than 200 Gauss were kept to build the histogram, which shows the homogeneity of the inclination direction in the filament zone.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{2509fig6.eps} \end{figure}$ Figure 6: Histogram of the azimuth direction in the central third of the map (in the filament zone). The azimuth is referred to the slit direction, which is also the meridian (map Oy axis). Only the points where the field strength $B_{\rm tot}$ is larger than 200 Gauss were kept to build the histogram, which shows the homogeneity of the azimuth direction in the filament zone.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2509fig7.eps}\par\includegraphics[width=8.8cm,clip]{2509fig3a.eps} \end{figure}$ Figure 7: For comparison, map of the 5576 Å line center second derivative (line insensitive to the magnetic field) ( top) and of the longitudinal magnetic field ( bottom), in the central third of the full map (not corrected for anamorphosis). The second derivative at line center is given in units of the the average flat field profile one. Each structure of the longitudinal magnetic field is associated with a structure of larger second derivative with the same shape.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2509fig3a.eps}\par\includegraphics[width=8.8cm,clip]{2509fig3b.eps} \end{figure}$	Figure 3: For detailed comparison, longitudinal magnetic field ( top) and transverse magnetic field intensity ( bottom) of the central third of the map (not corrected for anamorphosis). Each detail of the longitudinal field map corresponds to a detail with same shape on the transverse field map.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{2509fig5.eps} \end{figure}$	Figure 5: Histogram of the the inclination angle with respect to line-of-sight in the central third of the map (the filament zone). Only the points where field strength $B_{\rm tot}$ is larger than 200 Gauss were kept to build the histogram, which shows the homogeneity of the inclination direction in the filament zone.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{2509fig6.eps} \end{figure}$	Figure 6: Histogram of the azimuth direction in the central third of the map (in the filament zone). The azimuth is referred to the slit direction, which is also the meridian (map Oy axis). Only the points where the field strength $B_{\rm tot}$ is larger than 200 Gauss were kept to build the histogram, which shows the homogeneity of the azimuth direction in the filament zone.
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