code: def in_zstack(self, s, c, t):
          
          if (self.series == s
              and self.channel == c
              and self.timepoint == t):
              return True
          return False
docs: Return True if I am in the zstack.
  
          :param s: series
          :param c: channel
          :param t: timepoint
          :returns: :class:`bool`