<span class="o">=</span> <span class="n">dx_max</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">n_dxs</span> <span class="o">=</span> <span class="n">n_dxs</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">dy_min</span> <span class="o">=</span> <span class="n">dy_min</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">dy_max</span> <span class="o">=</span> <span class="n">dy_max</span>
    <span class="bp">self</span><spa