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<!-- DOI: 10.1051/0004-6361/200811149 -->

<h2 class="sec">Online Material</h2>

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<tr><td><!-- init Label --><A NAME="fig:fitted_spectra">&#160;</A><!-- end Label--><A NAME="2190"></A><A NAME="figure1995"
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<td class="img-txt"><span class="bold">Figure 9:</span><p>
DSS images and CO&nbsp;spectra obtained towards the 42 BRCs towards which emission is detected. The DSS images presented in <I> the left panels</I> are overlaid with contours of the MSX&nbsp;8&nbsp;<IMG
 ALIGN="MIDDLE" BORDER="0"
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 ALT="$\mu $">m emission which traces the PDR. The position of the IRAS point source associated with each&nbsp;cloud is indicated by a cross. Embedded MSX&nbsp;21&nbsp;<IMG
 ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$\mu $">m point source associated with each&nbsp;cloud are indicated by a triangle. In <I> the right panels</I> we present histogram plots of the three CO&nbsp;transitions and the fits to the data; these are coloured in black and red respectively.</p></td>
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<tr><td><!-- init Label --><!-- end Label--><A NAME="2007"></A><A NAME="figure2004"
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<td class="img-txt"><span class="bold">Figure 9:</span><p>
continued.</p></td>
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<td class="img-txt"><span class="bold">Figure 9:</span><p>
continued.</p></td>
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<td class="img-txt"><span class="bold">Figure 9:</span><p>
continued.</p></td>
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<td class="img-txt"><span class="bold">Figure 9:</span><p>
continued.</p></td>
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<td class="img-txt"><span class="bold">Figure 9:</span><p>
continued.</p></td>
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