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  <div class="section" id="unable-to-fit-curve-initial-parameter-equal-to-zero">
<h1>Unable to fit curve! Initial parameter equal to zero<a class="headerlink" href="#unable-to-fit-curve-initial-parameter-equal-to-zero" title="Permalink to this headline">Â¶</a></h1>
<p>The non-linear Hill regression failed to fit the data. Check that the penumbra is well form