from typing import Final

PDF_PREFACTOR: Final[float] = 0.3989424488876037
SQRT_TWO: Final[float] = 1.4142135623730951
SQRT_EPS: Final[float] = 1.4901161193847656e-08
EPS: Final[float] = 2.220446049250313e-16
CDF_ZERO: Final[float] = 0.5
