 <span class="stringliteral">&#39;EMC&#39;</span>,  <span class="comment"># ethyl mercury ion</span></div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;                                              <span class="stringliteral">&#39;Y1&#39;</span>,  <span class="comment"># yttrium ion</span></div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;                                              <span class="stringliteral">&#39;MO7&#39;</span>, <span clas