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lines 6-30 of file: at_cascade/get_fit_integrand.py
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{xrst_begin get_fit_integrand}

Determine the Set of Integrands in Data Table
#############################################

Prototype
*********
{xrst_literal ,
   # BEGIN_DEF, END_DEF
   # BEGIN_RETURN, END_RETURN
}

fit_or_root
***********
This :ref:`fit_or_root_class-name` object has open connections
for the node we are fitting.

fit_integrand
*************
The return value *fit_integrand* is a python set of integrand_id
that appear in the data table in the *fit_database*.
Furthermore there is a row in the data table
where each such integrand_id is not held out.

{xrst_end get_fit_integrand}