Plot, set a color to a smooth line?

I am sorry for the easy question.

Would you suggest, how to set a color for a smooth line?

Thank you in advance.

It is actually a very difficult question since you did not say what plotting package you are using. Also, please provide an MWE.

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using Plots

But @Tamas_Papp is right, I would like to have the PSA sticky for everybody (not just for me, as I made it sticky for me)

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