KDE and plot the relative magnification vs time delay difference for lensed samples.</span>

<span class="sd">        Parameters</span>
<span class="sd">        ----------</span>
<span class="sd">        x_array : `float.array`</span>
<span class="sd">            x array.</span>
<span class="sd">        y_array : `float.array`</span>
<span class="sd">            y array.</span>
<span class="sd">        xscale : `str`</span>
<span class="sd">            x-axis scale.</span>
<span class="sd">            defau