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variable: $preclustfthr -- hard thresh before cluster filter
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default: 5.0

"NormSamp, Clust Controls" parameter.  To adjust,
access pop-up by L-click on "label:" (bold).

This variable controls the hard threshold for
minimum-cluster-size-filtered statistics produced
by surfclust (run by "CS" button on "val:" line).

This is passed directly to surfclust as
follows:

  surfclust ... -thresh $preclustfthr ...

For more details on the operation of surfclust,
see:

  Help -> Cross Session Spherical Average
