Three parameters can be specified: max_indx, max_chisq and min_angle. These parameters
influence the initial refinement of the non-conventional unit cells found by TRCELL.
The parameter max_indx (default 5) is the maximum value for |u|, |v|, or |w| used to
index the selected ndlvs. The second parameter max_chisq (default 250.0) is used to speed up the indexing
of the ndlvs by rejecting all the combinations u v w that give a 
larger
than max_chisq. The third parameter min_angle (default 1.0) is used for two things:
i) it specifies the minimum angle
between an ndlv and a calculated direct lattice vector before the ndlv is
considered to be indexed, ii) it specifies the minimum angle between two ndlvs that have
a minimum of mcombine spots contributing to it in common, before these two conics are combined.
format refine max_indx max_chisq min_angle default refine 5 250.0 1.0 example refine 6 300.0 1.0