pan><span class="string">"f"</span><span class="special">,</span> <span class="identifier">f</span><span class="special">,</span> <span class="special">(</span><span class="identifier">arg</span><span class="special">(</span><span class="string">"x"</span><span class="special">),</span> <span class="string">"y"</span><span class="special">,</span> <span class="identifier">arg</span><span class="special">(</span><span class="string">"z"</span><span class="special">)=</span><span class="number">0.0</span><spa