code: def H13(self):
          "Information measure of correlation 2."
          # An imaginary result has been encountered once in the Matlab
          # version.  The reason is unclear.
          return np.sqrt(1 - np.exp(-2 * (self.hxy2 - self.H9()))f H13(self):
          "Information measure of correlation 2."
          # An imaginary result has been encountered once in the Matlab
          # version.  The reason is unclear.
          return np.sqrt(1 - np.exp(-2 * (self.hxy2 - self.H9())))
docs: Information measure of correlation 2.