))</span>
<span class="w">                     </span><span class="k">CALL </span><span class="n">NORPPF</span><span class="p">(</span><span class="n">P</span><span class="p">,</span><span class="n">zppf</span><span class="p">)</span>
<span class="w">                     </span><span class="n">x2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">amean</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="mf">0.5_wp</span><span 