span><span class="n">ecc</span> <span class="o">=</span> <span class="mf">0.</span>                             <span class="c1">#eccentricity   </span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">params</span><span class="o">.</span><span class="n">w</span> <span class="o">=</span> <span class="mf">90.</span>                              <span class="c1">#longitude of periastron (in degrees) </span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">params</span><span class="o">.</span><span cla