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<!-- DOI: 10.1051/0004-6361/200810870 -->

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

<p>

<A NAME="tab1"></A><p class="inset-old"><a href="/articles/aa/full_html/2009/15/aa10870-08/table1.html"><span class="bold">Table 1:</span></a>&#160;&#160;
Description of the data sets.</p>
<p>

<div class="inset-old">
<table>
<tr><td><!-- init Label --><A NAME="ngc1987">&#160;</A><!-- end Label--><A NAME="1187"></A><A NAME="figure949"
 HREF="img110.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg110.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f13.ps}
\end{figure}"></A><!-- HTML Figure number: 22 --></td>
<td class="img-txt"><span class="bold">Figure 13:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;1987.</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=22&DOI=10.1051/0004-6361/200810870" target="DEXTER">Open with DEXTER</a></td></tr>

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<table>
<tr><td><!-- init Label --><A NAME="ngc2108">&#160;</A><!-- end Label--><A NAME="1188"></A><A NAME="figure955"
 HREF="img111.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg111.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f14.ps}
\end{figure}"></A><!-- HTML Figure number: 23 --></td>
<td class="img-txt"><span class="bold">Figure 14:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;2108.</p></td>
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<tr><td><!-- init Label --><A NAME="hodge7">&#160;</A><!-- end Label--><A NAME="1189"></A><A NAME="figure961"
 HREF="img112.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg112.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f15.ps}
\end{figure}"></A><!-- HTML Figure number: 24 --></td>
<td class="img-txt"><span class="bold">Figure 15:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for HODGE&nbsp;7.</p></td>
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<tr><td><!-- init Label --><A NAME="ngc1852">&#160;</A><!-- end Label--><A NAME="1190"></A><A NAME="figure967"
 HREF="img113.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg113.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f16.ps}
\end{figure}"></A><!-- HTML Figure number: 25 --></td>
<td class="img-txt"><span class="bold">Figure 16:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;1852.</p></td>
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<tr><td><!-- init Label --><A NAME="ngc1917">&#160;</A><!-- end Label--><A NAME="1191"></A><A NAME="figure973"
 HREF="img114.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg114.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f17.ps}
\end{figure}"></A><!-- HTML Figure number: 26 --></td>
<td class="img-txt"><span class="bold">Figure 17:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;1917.</p></td>
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<tr><td><!-- init Label --><A NAME="ngc2154">&#160;</A><!-- end Label--><A NAME="1192"></A><A NAME="figure979"
 HREF="img115.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg115.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f18.ps}
\end{figure}"></A><!-- HTML Figure number: 27 --></td>
<td class="img-txt"><span class="bold">Figure 18:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;2154.</p></td>
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<tr><td><!-- init Label --><A NAME="ic2146">&#160;</A><!-- end Label--><A NAME="1193"></A><A NAME="figure985"
 HREF="img116.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg116.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f19.ps}
\end{figure}"></A><!-- HTML Figure number: 28 --></td>
<td class="img-txt"><span class="bold">Figure 19:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for IC&nbsp;2146.</p></td>
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<table>
<tr><td><!-- init Label --><A NAME="ngc1644">&#160;</A><!-- end Label--><A NAME="1194"></A><A NAME="figure991"
 HREF="img117.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg117.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f20.ps}
\end{figure}"></A><!-- HTML Figure number: 29 --></td>
<td class="img-txt"><span class="bold">Figure 20:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;1644.</p></td>
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<tr><td><!-- init Label --><A NAME="ngc1652">&#160;</A><!-- end Label--><A NAME="1195"></A><A NAME="figure997"
 HREF="img118.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg118.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f21.ps}
\end{figure}"></A><!-- HTML Figure number: 30 --></td>
<td class="img-txt"><span class="bold">Figure 21:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;1652.</p></td>
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<div class="inset-old">
<table>
<tr><td><!-- init Label --><A NAME="ngc1795">&#160;</A><!-- end Label--><A NAME="1196"></A><A NAME="figure1003"
 HREF="img119.png"><IMG
 WIDTH="94" HEIGHT="94" SRC="Timg119.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f22.ps}
\end{figure}"></A><!-- HTML Figure number: 31 --></td>
<td class="img-txt"><span class="bold">Figure 22:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;1795.</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=31&DOI=10.1051/0004-6361/200810870" target="DEXTER">Open with DEXTER</a></td></tr>

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<p>
<div class="inset-old">
<table>
<tr><td><!-- init Label --><A NAME="ngc1978">&#160;</A><!-- end Label--><A NAME="1197"></A><A NAME="figure1009"
 HREF="img120.png"><IMG
 WIDTH="95" HEIGHT="94" SRC="Timg120.png"
 ALT="\begin{figure}
\par\includegraphics[width=8.75cm]{0870f23.ps}
\end{figure}"></A><!-- HTML Figure number: 32 --></td>
<td class="img-txt"><span class="bold">Figure 23:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#NGC1846">7</a> for NGC&nbsp;1978.</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=32&DOI=10.1051/0004-6361/200810870" target="DEXTER">Open with DEXTER</a></td></tr>

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<div class="inset-old">
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<tr><td><!-- init Label --><A NAME="compB">&#160;</A><!-- end Label--><A NAME="1198"></A><A NAME="figure1017"
 HREF="img121.png"><IMG
 WIDTH="206" HEIGHT="198" SRC="Timg121.png"
 ALT="\begin{figure}
\par\includegraphics[width=18cm]{0870f32.ps}
\end{figure}"></A><!-- HTML Figure number: 33 --></td>
<td class="img-txt"><span class="bold">Figure 32:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#compA">31</a> for NGC&nbsp;1846, NGC&nbsp;1806, and NGC&nbsp;1751. </p></td>
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<tr><td><!-- init Label --><A NAME="compC">&#160;</A><!-- end Label--><A NAME="1199"></A><A NAME="figure1023"
 HREF="img122.png"><IMG
 WIDTH="195" HEIGHT="187" SRC="Timg122.png"
 ALT="\begin{figure}
\par\includegraphics[width=17cm,clip]{0870f33.ps}
\end{figure}"></A><!-- HTML Figure number: 34 --></td>
<td class="img-txt"><span class="bold">Figure 33:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#compA">31</a> for NGC&nbsp;1987, NGC&nbsp;2108 and
      ESO057-SC075. </p></td>
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<tr><td><!-- init Label --><A NAME="compD">&#160;</A><!-- end Label--><A NAME="1200"></A><A NAME="figure1029"
 HREF="img123.png"><IMG
 WIDTH="188" HEIGHT="138" SRC="Timg123.png"
 ALT="\begin{figure}
\par\includegraphics[width=17cm,clip]{0870f34.ps}
\end{figure}"></A><!-- HTML Figure number: 35 --></td>
<td class="img-txt"><span class="bold">Figure 34:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#compA">31</a> for NGC&nbsp;1783 and NGC&nbsp;1852. </p></td>
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<tr><td><!-- init Label --><A NAME="compE">&#160;</A><!-- end Label--><A NAME="1201"></A><A NAME="figure1035"
 HREF="img124.png"><IMG
 WIDTH="195" HEIGHT="191" SRC="Timg124.png"
 ALT="\begin{figure}
\par\includegraphics[width=17cm,clip]{0870f35.ps}
\end{figure}"></A><!-- HTML Figure number: 36 --></td>
<td class="img-txt"><span class="bold">Figure 35:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#compA">31</a> for
      NGC&nbsp;1975, NGC&nbsp;1644, and NGC&nbsp;1652. </p></td>
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<tr><td><!-- init Label --><A NAME="compF">&#160;</A><!-- end Label--><A NAME="1202"></A><A NAME="figure1041"
 HREF="img125.png"><IMG
 WIDTH="206" HEIGHT="137" SRC="Timg125.png"
 ALT="\begin{figure}
\par\includegraphics[width=18cm]{0870f36.ps}
\end{figure}"></A><!-- HTML Figure number: 37 --></td>
<td class="img-txt"><span class="bold">Figure 36:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#compA">31</a> for NGC&nbsp;1978 and IC&nbsp;2146. </p></td>
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<tr><td><!-- init Label --><A NAME="iso2">&#160;</A><!-- end Label--><A NAME="1203"></A><A NAME="figure1049"
 HREF="img126.png"><IMG
 WIDTH="194" HEIGHT="192" SRC="Timg126.png"
 ALT="\begin{figure}
\par\includegraphics[width=17cm,clip]{0870f38.ps}
\end{figure}"></A><!-- HTML Figure number: 38 --></td>
<td class="img-txt"><span class="bold">Figure 38:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#iso1">37</a> for NGC&nbsp;1652, NGC&nbsp;1644, NGC&nbsp;1917,
      HODGE7, NGC&nbsp;1852, and NGC&nbsp;2154.</p></td>
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   <div class="inset-old">
<table>
<tr><td><!-- init Label --><A NAME="iso3">&#160;</A><!-- end Label--><A NAME="1204"></A><A NAME="figure1055"
 HREF="img127.png"><IMG
 WIDTH="194" HEIGHT="138" SRC="Timg127.png"
 ALT="\begin{figure}
\par\includegraphics[width=17cm,clip]{0870f39.ps}
\end{figure}"></A><!-- HTML Figure number: 39 --></td>
<td class="img-txt"><span class="bold">Figure 39:</span><p>
As in Fig.&nbsp;<a href="/articles/aa/full_html/2009/15/aa10870-08/aa10870-08.html#iso1">37</a> for IC&nbsp;2146, NGC&nbsp;2108, NGC&nbsp;1978,
      and NGC&nbsp;1795. </p></td>
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