How can I find the root options?

[Tyao]

    ch.Add("dpdm*.root");
    ch.Draw("mhadfit:Umissfit>>h1d", cut, "goff");

here is the code confusing me.
I can’t find the ch.Draw option = “goff”;
What does it mean and Where can I find the option of ch.Draw()?

[Wile_E_Coyote]

TTree::Draw

[Tyao]

Thanku!!!