class="simple simple-toc-section">
      <li><a class="reference" href="#mp_config"
    title="mp_config = mp_config_struct">mp_config</a></li>
  <li><a class="reference" href="#mp_config_struct"
    title="mp_config_struct {.bycopy.} = object
  ftol*: cdouble ## NOTE: the user may set the value explicitly; OR, if the passed
                 ##     value is zero, then the &quot;Default&quot; value will be substituted by
                 ##     mpfit().
                 ## Relative chi-square convergence cri