# 12.4 Error and Related Functions

The following two plots illustrate how derived formulas for the $erf(y)$ and $erfc(y)$ functions successively converge to the reference functions (dashed-gray curves) for $y>0$ as the evaluation limit is successively increased (green, orange, and blue curves).
The following plot illustrates how a derived formula for the Dawson $F(y)$ function successively converges to the reference function (dashed-gray curve) for $y\in\mathbb{R}$ as the evaluation limit is successively increased (green, orange, and blue curves).