#... where 'SusyNtuple' is a doing word
Superflow is a package that analyzes susyNt so it is assumed that the SusyNtuple package is already checked out in your working directory. If you do not yet have a SusyNtuple-ready working area, go to susynt-read and follow the directions in the README for getting set-up to read the SusyNt from your needed producation tag.