class="n">var</span><span class="p">())</span>
  <span class="n">hcb</span> <span class="o">=</span> <span class="n">spline</span> <span class="o">+</span> <span class="mi">5</span> <span class="o">*</span> <span class="n">sd</span>
  <span class="n">lcb</span> <span class="o">=</span> <span class="n">spline</span> <span class="o">-</span> <span class="mi">5</span> <span class="o">*</span> <span class="n">sd</span>
  <span class="n">out</span> <span class="o">=</span> <span class="p">(</span><span class="n"