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<!-- DOI: 10.1051/0004-6361/200911870 -->

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

<p>
<div class="inset-old">
<table>
<tr><td><!-- init Label --><A NAME="N0628_spix">&#160;</A><!-- end Label--><A NAME="1293"></A><A NAME="figure1118"
 HREF="img76.png"><IMG
 WIDTH="204" HEIGHT="103" SRC="Timg76.png"
 ALT="\begin{figure}
\par\includegraphics[width=18cm]{11870fg6.eps}
\end{figure}"></A><!-- HTML Figure number: 6 --></td>
<td class="img-txt"><span class="bold">Figure 6:</span><p>
Galaxy NGC&nbsp;0628 -&nbsp;<I> Left panel</I>: the color scale 
represents 
the image of the spectral index 
measured between 327&nbsp;MHz and 1.4&nbsp;GHz. Pixels with an intensity level 
above 3<IMG
 WIDTH="12" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$\sigma $">
at both frequencies have been considered.
Contours levels of the radio image at 1.4&nbsp;GHz, starting from 3<IMG
 WIDTH="12" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$\sigma $">
and 
scaling by a factor of <IMG
 WIDTH="23" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
 SRC="img3.png"
 ALT="$\sqrt {2}$">,
are overlaid on the image. 
The <I> FWHM</I> of this image is  
<!-- MATH: $66\hbox{$^{\prime\prime}$ }\times66\hbox{$^{\prime\prime}$ }$ -->
<IMG
 WIDTH="69" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img7.png"
 ALT="$66\hbox {$^{\prime \prime }$ }\times 66\hbox {$^{\prime \prime }$ }$">.
<I> Right panel</I>: the color scale represents the image of the spectral 
index uncertainty.</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=6&DOI=10.1051/0004-6361/200911870" target="DEXTER">Open with DEXTER</a></td></tr>

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<tr><td><!-- init Label --><A NAME="N0628_spix_rad">&#160;</A><!-- end Label--><A NAME="1294"></A><A NAME="figure1127"
 HREF="img77.png"><IMG
 WIDTH="200" HEIGHT="85" SRC="Timg77.png"
 ALT="\begin{figure}
\par\includegraphics[width=17.6cm]{11870fg7.eps}
\end{figure}"></A><!-- HTML Figure number: 7 --></td>
<td class="img-txt"><span class="bold">Figure 7:</span><p>
Galaxy NGC&nbsp;0628: spectral index radial 
profile (<I> left panel</I>) and spectral index variation with 
IR-70&nbsp;<IMG
 WIDTH="10" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img8.png"
 ALT="$\mu $">m brightness (<I> right panel</I>).</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=7&DOI=10.1051/0004-6361/200911870" 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="N3627_spix">&#160;</A><!-- end Label--><A NAME="1295"></A><A NAME="figure1134"
 HREF="img78.png"><IMG
 WIDTH="204" HEIGHT="102" SRC="Timg78.png"
 ALT="\begin{figure}
\par\includegraphics[width=18cm]{11870fg8.eps}
\end{figure}"></A><!-- HTML Figure number: 8 --></td>
<td class="img-txt"><span class="bold">Figure 8:</span><p>
Galaxy NGC&nbsp;3627 -&nbsp;<I> Left panel</I>: the color scale represents 
the image of the spectral index 
measured between 327&nbsp;MHz and 1.4&nbsp;GHz. Pixels with an intensity level 
above 3<IMG
 WIDTH="12" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$\sigma $">
at both frequencies have been considered.
Contours levels of the radio image at 1.4&nbsp;GHz, starting from 3<IMG
 WIDTH="12" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$\sigma $">
and 
scaling by a factor of <IMG
 WIDTH="23" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
 SRC="img3.png"
 ALT="$\sqrt {2}$">,
are overlaid on the image. 
The <I> FWHM</I> of this image is  
<!-- MATH: $20\hbox{$^{\prime\prime}$ }\times20\hbox{$^{\prime\prime}$ }$ -->
<IMG
 WIDTH="69" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img9.png"
 ALT="$20\hbox {$^{\prime \prime }$ }\times 20\hbox {$^{\prime \prime }$ }$">.
<I> Right panel</I>: the color scale represents the image of the spectral 
index uncertainty.
</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=8&DOI=10.1051/0004-6361/200911870" 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="N3627_spix_rad">&#160;</A><!-- end Label--><A NAME="1296"></A><A NAME="figure1143"
 HREF="img79.png"><IMG
 WIDTH="201" HEIGHT="86" SRC="Timg79.png"
 ALT="\begin{figure}
\par\includegraphics[width=17.65cm]{11870fg9.eps}
\end{figure}"></A><!-- HTML Figure number: 9 --></td>
<td class="img-txt"><span class="bold">Figure 9:</span><p>
Galaxy NGC&nbsp;3627: Spectral index radial 
profile (<I> left panel</I>) and spectral index variation with 
IR-70&nbsp;<IMG
 WIDTH="10" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img8.png"
 ALT="$\mu $">m brightness (<I> right panel</I>).</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=9&DOI=10.1051/0004-6361/200911870" target="DEXTER">Open with DEXTER</a></td></tr>

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<p>
<div class="inset-old">
<table>
<tr><td><!-- init Label --><A NAME="N7331_spix">&#160;</A><!-- end Label--><A NAME="1297"></A><A NAME="figure1150"
 HREF="img80.png"><IMG
 WIDTH="204" HEIGHT="103" SRC="Timg80.png"
 ALT="\begin{figure}
\par\includegraphics[width=18cm]{11870fg10.eps}
\end{figure}"></A><!-- HTML Figure number: 10 --></td>
<td class="img-txt"><span class="bold">Figure 10:</span><p>
Galaxy NGC&nbsp;7331 -&nbsp;<I> Left panel</I>: the color scale represents 
the image of the spectral index 
measured between 327&nbsp;MHz and 1.4&nbsp;GHz. Pixels with an intensity level 
above 3<IMG
 WIDTH="12" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$\sigma $">
at both frequencies have been considered.
Contours levels of the radio image at 1.4&nbsp;GHz, starting from 3<IMG
 WIDTH="12" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img2.png"
 ALT="$\sigma $">
and 
scaling by a factor of <IMG
 WIDTH="23" HEIGHT="33" ALIGN="MIDDLE" BORDER="0"
 SRC="img3.png"
 ALT="$\sqrt {2}$">,
are overlaid on the image. 
The <I> FWHM</I> of this image is  
<!-- MATH: $20\hbox{$^{\prime\prime}$ }\times20\hbox{$^{\prime\prime}$ }$ -->
<IMG
 WIDTH="69" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img9.png"
 ALT="$20\hbox {$^{\prime \prime }$ }\times 20\hbox {$^{\prime \prime }$ }$">.
<I> Right panel</I>: the color scale represents the image of the spectral 
index uncertainty.</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=10&DOI=10.1051/0004-6361/200911870" target="DEXTER">Open with DEXTER</a></td></tr>

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<div class="inset-old">
<table>
<tr><td><!-- init Label --><A NAME="N7331_spix_rad">&#160;</A><!-- end Label--><A NAME="1298"></A><A NAME="figure1159"
 HREF="img81.png"><IMG
 WIDTH="205" HEIGHT="87" SRC="Timg81.png"
 ALT="\begin{figure}
\par\includegraphics[width=18cm]{11870fg11.eps}
\end{figure}"><!-- HTML Figure number: 11 --></td>
<td class="img-txt"><span class="bold">Figure 11:</span><p>
Galaxy NGC&nbsp;7331: spectral index radial 
profile (<I> left panel</I>) and spectral index variation with 
IR-70&nbsp;<IMG
 WIDTH="10" HEIGHT="26" ALIGN="MIDDLE" BORDER="0"
 SRC="img8.png"
 ALT="$\mu $">m brightness (<I> right panel</I>).</p></td>
</tr><tr><td colspan="2"><a href="http://dexter.edpsciences.org/applet.php?pdf_id=11&DOI=10.1051/0004-6361/200911870" target="DEXTER">Open with DEXTER</a></td></tr>

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