All Figures

$\begin{figure} \par\includegraphics[width=11.25cm,clip]{aa0228-04f1.eps} %\end{figure}$ Figure 1: Longitude-dependent polarization behaviour of PSR B0329+54 in its normal profile mode at 328 MHz. Plotted are the mean total and polarized intensity (black and red, top panel) and histograms of position angle (middle panel, plotted twice for continuity) and $\sin 2\chi$ where $\chi$ is the ellipticity angle, along with the corresponding parameters of the mean polarization vector (black lines). For convenience the ordinate scale of the bottom panel is labelled non-linearly in terms of $\chi$ . The histograms are normalised by the peak density and plotted in the colour scale shown at the bottom. The dashed line in the middle panel shows the prediction under the magnetic pole model (Radhakrishnan & Cooke 1969), see text. The smooth behaviour seen is intrinsic to the pulsar, the longitude bin spacing is determined by the instrumental resolution.
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In the text

$\begin{figure} \par\includegraphics[clip]{aa0228-04f2.eps} \end{figure}$ Figure 2: Distribution of polarization orientations in eight longitude intervals, marked in the pulse profile at the bottom and shown in left-to-right, top-to-bottom order. Each panel shows the distribution in Lambert's azimuthal equal-area projection with poles set near to the typical orientation of the mode showing the least scatter. The projection is interrupted at the equator and plotted in two hemispheres, to give low distortion near both poles, marked by asterisks. Lines of constant $\psi$ and $\chi$ are marked for reference; meridians (constant $\psi$ ) converge at $\chi =45\hbox {$^\circ $ }$ (pure right-circular polarization) near the top of the projection. The colour scale is shown in Fig. 1, each density being normalised by the peak in each longitude interval.
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In the text

$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{0228f3.eps} }\end{figure}$ Figure 3: Results of eigenanalysis. The top panel shows the average intensity profile (thick solid line), the square roots of the eigenvalues (solid, dashed, dotted thin lines, in descending order of value), and the polarization entropy (Eq. (17); thick dotted line). The middle panel shows the position angle of the mean polarization vector (thick line, plotted repeatedly at offsets of $180\hbox {$^\circ $ }$ for continuity) and of the first eigenvector (thin line, plotted repeatedly at offsets of $90\hbox {$^\circ $ }$ for continuity under the equivalence of antiparallel vectors as eigenvectors). The bottom panel shows the ellipticity angle of the mean polarization vector (thick line) along with the ellipticity angle of the first eigenvector, plotted twice with opposite signs.
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In the text

$\begin{figure} \par {\includegraphics[width=8cm,clip]{0228f4.eps} }\end{figure}$ Figure 4: Distribution of polarization orientations deriving from a simulation involving GFR (see text). The projection used is as in Fig. 2, plotted in a linear grey density scale.
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In the text

$\begin{figure} \par {\includegraphics[width=7.8cm,clip]{0228fa1.eps} }\end{figure}$ Figure A.1: Observed values of Stokes I (open circles), Q (triangles), U (squares) and V (filled circles) in the peak longitude bin of PSR B0329+54, as a function of frequency. Predictions of the best-fitting model (incorporating all longitude bins) are shown with lines.

In the text

$\begin{figure} \par {\includegraphics[width=8cm,clip]{0228f4.eps} }\end{figure}$	Figure 4: Distribution of polarization orientations deriving from a simulation involving GFR (see text). The projection used is as in Fig. 2, plotted in a linear grey density scale.
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