definition"></a></dt>
<dd><p>Ensure that the input and output of the histogram are appropriate.
The input variables are the pulse phi of events, and the nbins.
The counts of each bin are calculated by dividing [0, 1] into number of nbins.</p>
<dl class="field-list">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>phi</strong> : array</p>
<blockquote>
<div><p>a set of phase value of events.</p>
</div></blockquote>
<p><strong>nbins</strong> : int</p>
<blockquote>
<div><p>the number o