Hi, Alex--

The defaults are as follows:

For the param.1D file,
+ finding a streak of at least 4 consecutive slices with abs difference > 0.3 (so, a few slices of ~large alternating brightness patches); the minimum streak size can be adjusted with the "-min_streak_len .." opt)
or
+ finding a single slices shows abs param value is >0.45 (recall: the param values were 'centered' around 0, so this is a pretty extreme fraction of being greater/less than other slices), or any pair of slices whose abs difference is >0.7 (so, dropout-like slices);

For the parcorr file, having at least 4 consecutive slices that each have with -1*correlation > 0.3 (so, again, large alternating brightness).

Again, these values are heuristic based on looking at example data sets from different places. Happy to have any feedback/comments.

--pt