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<!-- DOI: 10.1051/0004-6361/200912062 -->

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

<p><A NAME="obs"></A><p class="inset-old"><a href="/articles/aa/full_html/2009/43/aa12062-09/table4.html"><span class="bold">Table 4:</span></a>&#160;&#160;
Characteristics of the observations.</p>
<p><A NAME="IDfeat"></A><p class="inset-old"><a href="/articles/aa/full_html/2009/43/aa12062-09/table5.html"><span class="bold">Table 5:</span></a>&#160;&#160;
Signal-to-noise ratios for detections of crystalline silicate features,
amorphous silicate 10&nbsp;<IMG SRC="img2.png" ALT="$\mu $" ALIGN="MIDDLE" BORDER="0" HEIGHT="26" WIDTH="10">m feature and silica.</p>
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<tr><td><!-- init Label --><A NAME="sp:perseus"></A><!-- end Label--><A NAME="2664"></A><A NAME="figure2357" HREF="img135.png"><IMG SRC="Timg135.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f20.ps}
\end{figure}" HEIGHT="258" WIDTH="202"></A><!-- HTML Figure number: 15 -->
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<td class="img-txt"><span class="bold">Figure 15:</span><p>
Spitzer/IRS spectra of young stars in the Perseus cloud, in units of&nbsp;Jy. Gray areas correspond to 3-<IMG SRC="img1.png" ALT="$\sigma $" ALIGN="MIDDLE" BORDER="0" HEIGHT="26" WIDTH="13">&nbsp;uncertainties as estimated in Sect.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sec:uncertainties">2.4</a>.
Sources are sorted by increasing Right Ascension. Red color is for
SL&nbsp;module, orange for SH, blue for LL and dark purple for&nbsp;LH.
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<tr><td><!-- init Label --><A NAME="sp:taurus"></A><!-- end Label--><A NAME="2665"></A><A NAME="figure2363" HREF="img136.png"><IMG SRC="Timg136.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f21.ps}
\end{figure}" HEIGHT="128" WIDTH="204"></A><!-- HTML Figure number: 16 -->
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<td class="img-txt"><span class="bold">Figure 16:</span><p>
Same as Fig.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sp:perseus">15</a> but for the Taurus star sample.
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<tr><td><!-- init Label --><A NAME="sp:chama_1"></A><!-- end Label--><A NAME="2666"></A><A NAME="figure2369" HREF="img137.png"><IMG SRC="Timg137.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f22.ps}
\end{figure}" HEIGHT="258" WIDTH="202"></A><!-- HTML Figure number: 17 -->
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<td class="img-txt"><span class="bold">Figure 17:</span><p>
Same as Fig.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sp:perseus">15</a> but for the Chamaleon star sample.
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<tr><td><!-- init Label --><A NAME="sp:chama_2"></A><!-- end Label--><A NAME="2667"></A><A NAME="figure2375" HREF="img138.png"><IMG SRC="Timg138.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f23.ps}
\end{figure}" HEIGHT="84" WIDTH="202"></A><!-- HTML Figure number: 18 -->
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<td class="img-txt"><span class="bold">Figure 18:</span><p>
Spitzer/IRS spectra for the Chamaleon sample: continued.
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<tr><td><!-- init Label --><A NAME="sp:lupus"></A><!-- end Label--><A NAME="2668"></A><A NAME="figure2380" HREF="img139.png"><IMG SRC="Timg139.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f24.ps}
\end{figure}" HEIGHT="258" WIDTH="202"></A><!-- HTML Figure number: 19 -->
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<td class="img-txt"><span class="bold">Figure 19:</span><p>
Same as Fig.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sp:perseus">15</a> but for the Lupus star sample.
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<tr><td><!-- init Label --><A NAME="sp:oph_1"></A><!-- end Label--><A NAME="2669"></A><A NAME="figure2386" HREF="img140.png"><IMG SRC="Timg140.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f25.ps}
\end{figure}" HEIGHT="258" WIDTH="202"></A><!-- HTML Figure number: 20 -->
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<td class="img-txt"><span class="bold">Figure 20:</span><p>
Same as Fig.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sp:perseus">15</a> but for the Ophiuchus star sample.
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<tr><td><!-- init Label --><A NAME="sp:oph_2"></A><!-- end Label--><A NAME="2670"></A><A NAME="figure2392" HREF="img141.png"><IMG SRC="Timg141.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f26.ps}
\end{figure}" HEIGHT="129" WIDTH="203"></A><!-- HTML Figure number: 21 -->
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<td class="img-txt"><span class="bold">Figure 21:</span><p>
Spitzer/IRS spectra for the Ophiuchus sample: continued.
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<tr><td><!-- init Label --><A NAME="sp:serpens"></A><!-- end Label--><A NAME="2671"></A><A NAME="figure2397" HREF="img142.png"><IMG SRC="Timg142.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f27.ps}
\end{figure}" HEIGHT="217" WIDTH="203"></A><!-- HTML Figure number: 22 -->
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<td class="img-txt"><span class="bold">Figure 22:</span><p>
Same as Fig.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sp:perseus">15</a> but for the Serpens star sample.
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<tr><td><!-- init Label --><A NAME="sp:others"></A><!-- end Label--><A NAME="2672"></A><A NAME="figure2403" HREF="img143.png"><IMG SRC="Timg143.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f28.ps}
\end{figure}" HEIGHT="42" WIDTH="204"></A><!-- HTML Figure number: 23 -->
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<td class="img-txt"><span class="bold">Figure 23:</span><p>
Same as Fig.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sp:perseus">15</a> but for the 3&nbsp;isolated stars in our sample.
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<tr><td><!-- init Label --><A NAME="sp:agb"></A><!-- end Label--><A NAME="2673"></A><A NAME="figure2409" HREF="img144.png"><IMG SRC="Timg144.png" ALT="\begin{figure}
\par\includegraphics[width=18cm,clip]{12062f29.ps}
\end{figure}" HEIGHT="85" WIDTH="203"></A><!-- HTML Figure number: 24 -->
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<td class="img-txt"><span class="bold">Figure 24:</span><p>
Same as Fig.&nbsp;<a href="/articles/aa/full_html/2009/43/aa12062-09/aa12062-09.html#sp:perseus">15</a> but for the 4&nbsp;objects with spectra similar to C-rich and O-rich AGB&nbsp;stars.
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