d>   diag_integral_end is the destructor for diag_integral_mod. </dd>
<dt>
<a href="#set_axis_time">set_axis_time</a>:</dt>
<dd>   Function to convert input time to a time_type </dd>
<dt>
<a href="#get_field_index">get_field_index</a>:</dt>
<dd>   get_field_index returns returns the index associated with an 
   integral name. </dd>
<dt>
<a href="#write_field_averages">write_field_averages</a>:</dt>
<dd>   Subroutine to sum multiple fields, average them and then write the result
   to an output file. </dd>
<