an><span class="n">gradB_PHI</span><span class="p">,</span><span class="n">gradB_Z</span><span class="p">,</span> <span class="p">&amp;</span>
     <span class="n">flag_cache</span><span class="p">)</span>
  <span class="kt">INTEGER</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">pchunk</span>
  <span class="kt">REAL</span><span class="p">(</span><span class="n">rp</span><span cl