the amplitude of NII6583.</p>
<dl class="field-list simple">
<dt class="field-odd">Returns<span class="colon">:</span></dt>
<dd class="field-odd"><p>Constraint on NII doublet relative amplitudes</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="LUCI.LuciFit.Fit.amplitude_constraint">
<span class="sig-name descname"><span class="pre">amplitude_constraint</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#LUCI.LuciFit.Fi