lt xscale = &#39;log10&#39;. other options: &#39;log&#39;, None.</span>
<span class="sd">        yscale : `str`</span>
<span class="sd">            y-axis scale.</span>
<span class="sd">            default yscale = &#39;log10&#39;. other options: &#39;log&#39;, None.</span>
<span class="sd">        alpha : `float`</span>
<span class="sd">            transparency of the contour plot.</span>
<span class="sd">            default alpha = 0.6.</span>
<span class="sd">        extent : `list`</span>
<span class="s