What's the predefined function "bigauss"?

The predefined function “gaus” refer to :[0]exp(-pow((x-[1])/[2], 2))
what does the function “bigauss” refer to? I know it corresponds to function ROOT::Math::bigaussian_pdf
what’s the order of the parameters of ‘‘bigauss’’?

Try:

TF2 f("f", "bigaus", -1., 1., -1., 1.);
f.Print();

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