const math.e4

2 uses

	math (current package)
		erfinv.go#L55: 	e4 = 2.65321895265761230930e-2
		erfinv.go#L106: 			z1 = ((((((e7*r+e6)*r+e5)*r+e4)*r+e3)*r+e2)*r+e1)*r + e0