const math.b4

2 uses

	math (current package)
		erfinv.go#L29: 	b4 = 2.1213794301586595867e4
		erfinv.go#L95: 		z2 := ((((((b7*r+b6)*r+b5)*r+b4)*r+b3)*r+b2)*r+b1)*r + b0