All Figures

$\begin{figure} \par\includegraphics[width=12cm,clip]{1062fig1.eps} \end{figure}$ Figure 1: Stacked single pulses with two intermittent nulls in lighter grey.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1062fig2.eps} \end{figure}$ Figure 2: Energy histogram for PSR B0818-13. In light grey we show the energy distribution of the energies found in the on-pulse window. In black we show the energies found in an equally large off-pulse window, caused by system noise. The set of low-energy pulses detached from both the normal and the null distribution are probably half-nulls.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{1062fig3.eps} \end{figure}$ Figure 3: Histogram of the null lengths.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{1062fig4.eps} \end{figure}$ Figure 4: Histogram of the event lengths.
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In the text

$\begin{figure} \par\includegraphics[width=8.75cm,clip]{1062fig5.eps} % \end{figure}$ Figure 5: Average profile around nulls. Black line: average profile for normal pulses. Dotted line: average profile for all pulses directly before a null. Dashed line: average profile for all pulses directly after a null. We have used all (500+) nulls, including those in groups.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{1062fig6.eps} \end{figure}$ Figure 6: Average profile around lows, as in Fig. 5. Again, the black line represents the average pulse profile. The dotted and dashed lines are the profiles before and after the low in this case. The dashed-dotted line shows the average profile for the low-energy pulses.
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In the text

$\begin{figure} \par\includegraphics[width=18cm,clip]{1062fig7.eps} \end{figure}$ Figure 7: Subpulse-pattern longitude jumps over continuous nulls. Each mark is the jump over one null. a) Mapped into a region from $-\frac{3}{4}$ P₂ to $\frac{1}{4}$ P₂ around the expected location in the continuous-drift case. b) The same data, duplicated to show subpulse grouping, with simulated pre-null subpulse positions added for clarity. The vertical dashed-dotted line predicts subpulse positions for a total stop of all drift during the null. The dashed lines are the prediction if drifting continuous during the null as it did before, for non-aliased drift. The dotted lines show which subpulses one spark makes if the drift is aliased. c) The same data, now with the predicted aliased subpulse path (dotted line), and the actual lower driftrate (solid line).
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{1062fig8.eps} \end{figure}$ Figure 8: As Fig. 7, but now for intermittent nulls.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{1062fig1.eps} \end{figure}$	Figure 1: Stacked single pulses with two intermittent nulls in lighter grey.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1062fig2.eps} \end{figure}$	Figure 2: Energy histogram for PSR B0818-13. In light grey we show the energy distribution of the energies found in the on-pulse window. In black we show the energies found in an equally large off-pulse window, caused by system noise. The set of low-energy pulses detached from both the normal and the null distribution are probably half-nulls.
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$\begin{figure} \par\includegraphics[width=8.6cm,clip]{1062fig3.eps} \end{figure}$	Figure 3: Histogram of the null lengths.
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$\begin{figure} \par\includegraphics[width=8.6cm,clip]{1062fig4.eps} \end{figure}$	Figure 4: Histogram of the event lengths.
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$\begin{figure} \par\includegraphics[width=8.75cm,clip]{1062fig5.eps} % \end{figure}$	Figure 5: Average profile around nulls. Black line: average profile for normal pulses. Dotted line: average profile for all pulses directly before a null. Dashed line: average profile for all pulses directly after a null. We have used all (500+) nulls, including those in groups.
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$\begin{figure} \par\includegraphics[width=8.6cm,clip]{1062fig6.eps} \end{figure}$	Figure 6: Average profile around lows, as in Fig. 5. Again, the black line represents the average pulse profile. The dotted and dashed lines are the profiles before and after the low in this case. The dashed-dotted line shows the average profile for the low-energy pulses.
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$\begin{figure} \par\includegraphics[width=12cm,clip]{1062fig8.eps} \end{figure}$	Figure 8: As Fig. 7, but now for intermittent nulls.
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