/span><span class="n">t</span><span class="o">-</span><span class="n">phase</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">pi</span><span class="o">/</span><span class="mf">180.</span><span class="p">)</span>

    <span class="n">subtide_freq</span> <span class="o">=</span> <span class="mf">2.</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">pi</span><span class="o">/</span><span class="p">(</span><span class="mf">