docs: def count_of_wells(self):
          """Number of wells in x/y-direction of template.
  
          Returns
          -------
          tuple
              (xs, ys) number of wells in x and y direction.
          """
          xs = set([w.attrib['WellX'] for w in self.wells])
          ys = set([w.attrib['WellY'] for w in self.wells])
          return (len(xs), len(ys))