hidden function to merge the list of results into one
		dictionary and 'normalize' the time stamps

def _merge_results(self):
		"""
		hidden function to merge the list of results into one
		dictionary and 'normalize' the time stamps
		"""
		new_dict = {}
		for it in self.data:
			new_dict.update(it)

		for k,v in new_dict.items():
			for kk, vv in v.time_stamps.items():
				for kkk,vvv in vv.items():
					new_dict[k].time_stamps[kk][kkk] = vvv - self.HB_config['time_ref']

		self.data = new_dict