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<!-- DOI: 10.1051/0004-6361/200913181 -->

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

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Similar to Fig.&nbsp;<a href="/articles/aa/full_html/2009/45/aa13181-09/aa13181-09.html#fig2">2</a> at <i>t</i>= 16.1&nbsp;min.
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