All Figures

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig1.eps}\end{figure}$ Figure 1: Normalized light curve of HL Tau 76 during the 1999 WET campaign (XCOV18). All the runs used in the power spectrum computation are shown. We subtract unity to the normalized light curve so that its average value is 0. The fractional modulation intensity (mi) is plotted as a function of time (UT)(left side scale). Each panel corresponds to one day (right side scale).
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig2.eps} \end{figure}$ Figure 2: Fourier amplitude spectrum of HL Tau 76 in the range 0 to 2000 $\mu$ Hz. The amplitude expressed in milli-modulation amplitude (mma) is plotted as a function of the frequency expressed in $\mu$ Hz. Note that the vertical scale for the amplitude varies for each panel.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig3.eps}\end{figure}$ Figure 3: Same as Fig. 2 for the frequency range 2000 to 4000 $\mu$ Hz.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig4.eps}\end{figure}$ Figure 4: Same as Fig. 2 for the range 4000 to 6000 $\mu$ Hz.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig5.eps}\end{figure}$ Figure 5: Window function obtained during the 1999 WET campaign. The window function is shown on the same frequency scale than the Fourier amplitude spectrum. The upper panel shows the window function normalized to an amplitude of unity at maximum. The lower panel shows the same window function truncated at an amplitude of 0.2 for a better visibility of the remaining aliases
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig6.eps}\end{figure}$ Figure 6: Illustration of the frequency extraction process. The successive steps of prewhitening are shown for the first six frequencies. Each panel shows the Fourier amplitude spectrum, in unit of mma, in the frequency interval 0-3000 $\mu$ Hz. The panels are labelled from hl01 to hl07. The panel hl01 is the full Fourier spectrum. The next panel, hl02, is the Fourier spectrum after prewhitening by the largest amplitude peak at 1848 $\mu$ Hz. The next panel, hl03 is the Fourier spectrum after prewhitening by the two largest amplitude peaks at 1848 $\mu$ Hz and 2023 $\mu$ Hz, etc. The last panel shows the residuals after prewhitening by the first 52 largest amplitude frequencies. All the remaining low amplitude but still significant peaks are linear combination of the previously extracted largest amplitude peaks.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig1.eps}\end{figure}$	Figure 1: Normalized light curve of HL Tau 76 during the 1999 WET campaign (XCOV18). All the runs used in the power spectrum computation are shown. We subtract unity to the normalized light curve so that its average value is 0. The fractional modulation intensity (mi) is plotted as a function of time (UT)(left side scale). Each panel corresponds to one day (right side scale).
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig2.eps} \end{figure}$	Figure 2: Fourier amplitude spectrum of HL Tau 76 in the range 0 to 2000 $\mu$ Hz. The amplitude expressed in milli-modulation amplitude (mma) is plotted as a function of the frequency expressed in $\mu$ Hz. Note that the vertical scale for the amplitude varies for each panel.
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig3.eps}\end{figure}$	Figure 3: Same as Fig. 2 for the frequency range 2000 to 4000 $\mu$ Hz.
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig4.eps}\end{figure}$	Figure 4: Same as Fig. 2 for the range 4000 to 6000 $\mu$ Hz.
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{3149fig5.eps}\end{figure}$	Figure 5: Window function obtained during the 1999 WET campaign. The window function is shown on the same frequency scale than the Fourier amplitude spectrum. The upper panel shows the window function normalized to an amplitude of unity at maximum. The lower panel shows the same window function truncated at an amplitude of 0.2 for a better visibility of the remaining aliases
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