ce spectrum axis AND normalized as described in Rhea et al. 2020a.
:param mdn: Boolean to use MDN or not (default True)</p>
<dl class="field-list simple">
<dt class="field-odd">Returns<span class="colon">:</span></dt>
<dd class="field-odd"><p>Updates self.vel_ml</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="LUCI.LuciFit.Fit.fit">
<span class="sig-name descname"><span class="pre">fit</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><spa