nt">## lower/upper limit boundary value</span>
  <span class="Identifier">parname</span><span class="Operator">*</span><span class="Other">:</span> <span class="Identifier">cstring</span>          <span class="Comment">## Name of parameter, or 0 for none</span>
  <span class="Identifier">step</span><span class="Operator">*</span><span class="Other">:</span> <span class="Identifier">cdouble</span>             <span class="Comment">## Step size for finite difference</span>
  <span class="Identifier">relstep</