Error Bands around TF1

ROOT
1

Dear Rooters,

I have TF1 TF1 *f = new TF1("f","x/TMath::Sqrt((x*x) + (0.938*0.938))",0, 2) and I want to draw 1 Sigma error band around it, can you help me?

Thank you in advance

2

Functions have no errors.

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