To plot 'erf' function

[Pepe_Le_Pew]

TF1 f1("f1", "TMath::Erf(x)", -10, 10);
TF1 f2("f2", "TMath::Erfc(x)", -10, 10);
TF1 f3("f3", "TMath::ErfInverse(x)", -1, 1);
TF1 f4("f4", "TMath::ErfcInverse(x)", 0, 2);