class StoreValues:
    def __init__(self):
        # default +ve z value, z(1) = 0.8413
        self.z_one = 0.8413
        # default +ve z value, z(2.5) = 0.9938
        self.z_first = 0.9938
        # default -ve z value, z(-2.25) = 0.0122
        self.z_second = 0.0122
        # default +ve z value, z(1.25) = 0.8944
        self.z_third = 0.8944



