code: def read_tpld_stats(self):
          
          payloads_stats = OrderedDict()
          for tpld in self.tplds.values():
              payloads_stats[tpld] = tpld.read_stats()
          return payloads_stats
docs: :return: dictionary {tpld index {group name {stat name: value}}}.
              Sea XenaTpld.stats_captions.