code: def print_statistics(self):
          
          print("Q1 =", self.Q1)
          print("Q2 =", self.Q2)
          print("cR =", self.cR)
docs: Prints out the Q1, Q2, and cR statistics for the variogram fit.
          NOTE that ideally Q1 is close to zero, Q2 is close to 1,
          and cR is as small as possible.