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<!-- DOI: 10.1051/0004-6361/201014655 -->

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

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<tr><td><!-- init Label --><A NAME="Fig:pacsspectra"></A><!-- end Label--><A NAME="740"></A><A NAME="figure647" HREF="img105.png"><IMG SRC="Timg105.png" ALT="\begin{figure}
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<td class="img-txt"><span class="bold">Figure 2:</span><p>
Spectra of C/2006 W3 (Christensen) obtained with PACS on
November 8, 2009 (central pixel pointed on the comet nucleus). The
pixel size is 
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The wavelengths of
water lines are indicated by vertical dashed lines.
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<tr><td><!-- init Label --><A NAME="Fig:iram"></A><!-- end Label--><A NAME="741"></A><A NAME="figure655" HREF="img106.png"><IMG SRC="Timg106.png" ALT="\begin{figure}
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<td class="img-txt"><span class="bold">Figure 5:</span><p>
Spectra of C/2006 W3 (Christensen) observed with the IRAM 30-m telescope.
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<td class="img-txt"><span class="bold">Figure 6:</span><p>
Comparison of measured abundances relative to HCN in
comets C/2006 W3 (Christensen) and C/1995 O1 (Hale-Bopp) at 3.3&nbsp;AU
from the Sun.
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