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<!-- DOI: 10.1051/0004-6361/200911853 -->

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

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<tr><td><!-- init Label --><A NAME="FoVs">&#160;</A><!-- end Label--><A NAME="725"></A><A NAME="figure619"
 HREF="img61.png"><IMG
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\par\includegraphics[width=15cm]{11853f2.eps}
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<td class="img-txt"><span class="bold">Figure 2:</span><p>
Wide field DSS-2-infrared survey image of the G61.48+0.09 star-forming region. The squares represent the observed target <B> a)</B> and control <B> b)</B> fields of view.</p></td>
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<tr><td><!-- init Label --><A NAME="starSelection">&#160;</A><!-- end Label--><A NAME="726"></A><A NAME="figure626"
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<td class="img-txt"><span class="bold">Figure 3:</span><p>
2MASS CMD of the target field. The stars used for the photometric calibration are marked with open circles.</p></td>
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<tr><td><!-- init Label --><A NAME="cal066">&#160;</A><!-- end Label--><A NAME="727"></A><A NAME="figure631"
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<td class="img-txt"><span class="bold">Figure 4:</span><p>
Photometric calibration in the <I>J</I>-, <I>H</I>-, and <IMG
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 ALT="$K_{\rm S}$">-bands for the G61.48+0.09 field. <I> Left panels</I> show the photometric calibration from instrumental (INSTR) to the calibrated magnitudes (2MASS).  Central panels show the difference between the calibrated photometry and the 2MASS photometry. 
   <I> Right panels</I> show the PSF fitting&nbsp;<IMG
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parameter provided by ALLFRAME.</p></td>
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