code: def relativeAreaSTE(self):
          '''
          return STE area - relative to image area
          '''
          s = self.noSTE.shape
          return np.sum(self.mask_STE) / (s[0] * s[1]f relativeAreaSTE(self):
          '''
          return STE area - relative to image area
          '''
          s = self.noSTE.shape
          return np.sum(self.mask_STE) / (s[0] * s[1])
docs: return STE area - relative to image area