def cluster(self, window):
        """ Cluster the dict array, assuming it has the relevant Coinc colums,
        time1, time2, stat, and timeslide_id
        """
        # If no events, do nothing
        if len(self.time1) == 0 or len(self.time2) == 0:
            return self
        from pycbc.events import cluster_coincs
        interval = self.attrs['timeslide_interval']
        cid = cluster_coincs(self.stat, self.time1, self.time2,
                                 self.timeslide_id, interval, window)
        return self.select(cid)
Cluster the dict array, assuming it has the relevant Coinc colums,
        time1, time2, stat, and timeslide_id