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<!-- DOI: 10.1051/0004-6361/201014540 -->

<h2 class="sec">Online Material</h2>
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<tr><td><!-- init Label --><A NAME="fig3"></A><!-- end Label--><A NAME="642"></A><A NAME="figure551" HREF="img68.png"><IMG SRC="Timg68.png" ALT="\begin{figure}
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<td class="img-txt"><span class="bold">Figure 3:</span><p>
Temperature map (Fig.&nbsp;1a) for the field <i>l</i>=30<IMG SRC="img1.png" ALT="$^\circ $" align="bottom" BORDER="0" HEIGHT="14" WIDTH="9">.
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\end{figure}" HEIGHT="244" WIDTH="158"></A><!-- HTML Figure number: 4 -->
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<td class="img-txt"><span class="bold">Figure 4:</span><p>
Temperature map (Fig.&nbsp;1b) for the field <i>l</i>=59<IMG SRC="img1.png" ALT="$^\circ $" align="bottom" BORDER="0" HEIGHT="14" WIDTH="9">.
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\par\includegraphics[angle=0,width=14cm,clip]{14540fg5.ps}
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<td class="img-txt"><span class="bold">Figure 5:</span><p>
<!-- MATH: $250~{\rm \mu m}$ --><IMG SRC="img10.png" ALT="$250~{\rm\mu m} $" ALIGN="MIDDLE" BORDER="0" HEIGHT="26" WIDTH="46">
optical depth (Fig.&nbsp;1c) for the field <i>l</i>=30<IMG SRC="img1.png" ALT="$^\circ $" align="bottom" BORDER="0" HEIGHT="14" WIDTH="9">.
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<tr><td><!-- init Label --><!-- end Label--><A NAME="569"></A><A NAME="figure566" HREF="img71.png"><IMG SRC="Timg71.png" ALT="\begin{figure}
\par\includegraphics[angle=0,width=14cm,clip]{14540fg6.ps}
\end{figure}" HEIGHT="248" WIDTH="158"></A><!-- HTML Figure number: 6 -->
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<td class="img-txt"><span class="bold">Figure 6:</span><p>
<!-- MATH: $250~{\rm \mu m}$ --><IMG SRC="img10.png" ALT="$250~{\rm\mu m} $" ALIGN="MIDDLE" BORDER="0" HEIGHT="26" WIDTH="46">
optical depth (Fig.&nbsp;1d) for the field <i>l</i>=59<IMG SRC="img1.png" ALT="$^\circ $" align="bottom" BORDER="0" HEIGHT="14" WIDTH="9">.
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