oothing.</span>
<span class="sd">    d : int, optional, default=1</span>
<span class="sd">        Smoothing order.</span>

<span class="sd">    References</span>
<span class="sd">    ----------</span>
<span class="sd">    Eilers, P.H., 2003. A perfect smoother. Analytical chemistry, 75(14), pp.3631-3636.</span>
<span class="sd">    &quot;&quot;&quot;</span>

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