old parameters fitted from 1D HEG.&quot;&quot;&quot;</span>

    <span class="n">ex_lda</span> <span class="o">=</span> <span class="p">{}</span>
    <span class="n">ex_lda</span><span class="p">[</span><span class="s2">&quot;spin_polerised&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="p">{</span>
        <span class="s2">&quot;a&quot;</span><span class="p">:</span> <span class="o">-</span><span class="mf">1.1511</span><span class="p">,</span>
        <span class="s2">&quot;b&qu