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$\begin{figure} \par\includegraphics[width=5.2cm,clip]{2183fig1a.eps}\hspace*{2mm... ...}\hspace*{2mm} \includegraphics[width=5.2cm,clip]{2183fig1c.eps} \end{figure}$ Figure 1: a) TRACE field of view on April 21 ${{\rm st}}$ , 2002 at 01:49:57 UT. The square gives the location of the subfield used in the data-analysis. b) Slice of the data cube I for fixed vertical coordinate x₀=45.6 Mm, as a function of t and y (dashed line in Fig. 1a). The oscillatory motions of the tadpoles are clearly visible. The tadpole heads are indicated with dashed lines. The analysed tadpole edges are marked with letters. c) Slice of the data cube I averaged over y=32.8-36.4 Mm, as a function of t and x (between the dash-dotted lines in Fig. 1a). This range of y corresponds to the location of edge C and the analysed wave packets 2, 6 and 7. The solid lines indicate the location of tadpole heads.
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In the text

$\begin{figure} \par\includegraphics[width=3.6cm,clip]{2183fig2a.eps}\hspace*{2mm... ...}\hspace*{2mm} \includegraphics[width=3.6cm,clip]{2183fig2d.eps} \end{figure}$ Figure 2: Horizontal displacement $\xi _y$ as a function of x and t for edges A, B, C and D. Wave packets are visible as quasi-periodic sets of ridges.
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{2183fig3a.eps}\hspace*{2mm} ... ...s}\hspace*{2mm} \includegraphics[width=5cm,clip]{2183fig3f.eps} \end{figure}$ Figure 3: a)-b) Phase speed and displacement amplitude as a function of distance x for wave packets 1 and 3. In the plot of the phase speed, the thick, solid line is an inverse linear fit and the dashed line is the phase speed derived from t₀(x). In the plot of the amplitude, the solid line is a fitted exponential curve and the dashed line represents the minimum amplitude that can be resolved, i.e. half a TRACE pixel size. c) Wave packet phase speeds $V_{\rm ph0}$ and periods P from Table 1 as a function of time. The measurements from edges C and D are highlighted with solid circles. The dashed line is a linear fit through those points.
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In the text

$\begin{figure} \par\includegraphics[width=5.2cm,clip]{2183fig4.eps} \end{figure}$ Figure 4: Relative displacement $\delta \xi _y$ of wave packet 3 as a function of time for x = 45.2 Mm. The thick line is a fitted cosine function.
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In the text

$\begin{figure} \par\includegraphics[width=5.2cm,clip]{2183fig5.eps} \end{figure}$ Figure 5: Relative intensity (I-I₀)/I₀ as a function of time of the ray between edges C and D at x₀=45.6 Mm. The dashed and dot-dashed lines are best fit functions $(P_{\rm f}/P_{\rm f}(t_{{\rm ref}}))^{2.8 \pm 3.8}$ and $(V_{{\rm ph}0,{\rm f}}/V_{{\rm ph}0,{\rm f}}(t_{{\rm ref}}))^{-2.9 \pm 2.7}$ respectively.
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In the text

$\begin{figure} \par\includegraphics[width=3.6cm,clip]{2183fig2a.eps}\hspace{2mm... ...}\hspace{2mm} \includegraphics[width=3.6cm,clip]{2183fig2d.eps} \end{figure}$	Figure 2: Horizontal displacement $\xi _y$ as a function of x and t for edges A, B, C and D. Wave packets are visible as quasi-periodic sets of ridges.
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$\begin{figure} \par\includegraphics[width=5.2cm,clip]{2183fig4.eps} \end{figure}$	Figure 4: Relative displacement $\delta \xi _y$ of wave packet 3 as a function of time for x = 45.2 Mm. The thick line is a fitted cosine function.
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$\begin{figure} \par\includegraphics[width=5.2cm,clip]{2183fig5.eps} \end{figure}$	Figure 5: Relative intensity (I-I₀)/I₀ as a function of time of the ray between edges C and D at x₀=45.6 Mm. The dashed and dot-dashed lines are best fit functions $(P_{\rm f}/P_{\rm f}(t_{{\rm ref}}))^{2.8 \pm 3.8}$ and $(V_{{\rm ph}0,{\rm f}}/V_{{\rm ph}0,{\rm f}}(t_{{\rm ref}}))^{-2.9 \pm 2.7}$ respectively.
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