 <span class="k">type</span><span class="p">(</span><span class="n">domain_type</span><span class="p">),</span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span> <span class="kd">::</span> <span class="n">initial</span> <span class="c">!! Initial spectrum instance</span>
  <span class="k">type</span><span class="p">(</span><span class="n">domain_type</span><span class="p">),</span><span class="k">intent</span><span class="p">(</span><span class="n">in</spa