# Contour plot with an error function

I got trouble with the Contourplot function. Probably due to the precision of an error function. The function is wish to plot is

$$\frac{1}{2}+4.47e^{-1-0.02x^2+25\gamma^2-1+\frac{\gamma^2}{8\sigma^2}}\Big(1+\mathrm{Erf}\big(\frac{0.14/\gamma-7.14\gamma}{\sqrt{2}}\big)\Big)$$

as soon as $$\gamma$$ becomes too large, then the contour plot breaks down. My best guess is, that it have something to do with the error funtion which Matematic approx to $$-1$$. I have tried to set the precision by N[f(x),n], but without any luck.

• Is $\sigma$ constant? – AEngineer Feb 14 at 9:54
• Precise the value of $\sigma$ and the ranges you want to cover. This will help. – Claude Leibovici Feb 14 at 10:43
• Sorry, yes, $\sigma$ is constant. And, for completeness, $\sigma=0.7$. When you say "the range you want to cover" do you mean i should use the PlotRange function? This i have tried but it don't seem to help – MikkelBloch Feb 14 at 11:02
• I was asking for the range of $x$ and $\gamma$ – Claude Leibovici Feb 14 at 16:11