span>
  <span class="Identifier">deriv_reltol</span><span class="Operator">*</span><span class="Other">:</span> <span class="Identifier">cdouble</span>     <span class="Comment">## Relative tolerance for derivative debug</span>
                             <span class="Comment">## 			  printout</span>
  <span class="Identifier">deriv_abstol</span><span class="Operator">*</span><span class="Other">:</span> <span class="Identifier">cdouble</span>     <span class="Comment">## Absolute tolerance for derivative 