r">N01</span><span class="special">.</span><span class="identifier">location</span><span class="special">()</span>  <span class="comment">// aka N01.mean()</span>
  <span class="special">&lt;&lt;</span> <span class="string">", standard deviation "</span> <span class="special">&lt;&lt;</span> <span class="identifier">N01</span><span class="special">.</span><span class="identifier">scale</span><span class="special">()</span> <span class="comment">// aka N01.standard_deviation()</span>
  <span class="special">