s="n"><span class="pre">n</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">i1</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">i2</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">s</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#utils.north" title="Permalink to this definition">¶</a></dt>
<dd><p>Performs LS fit to s by
a degree-two polynomial in an orthogonal basis.
Function to be run with the Si