 is the counts of profile.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>please note the pulse fraction has valid physical meaning only if the input profile
is folded by the net lightcurve or the background level can be well estimated and
subtracted from the observed pulse profile.</p>
</div>
<dl class="field-list">
<dt class="field-odd">Returns</dt>
<dd class="field-odd"><p>pf: float</p>
<blockquote>
<div><p>The pulse fraction of profile</p>
</div></blockquote>
<p>pf_err: float<