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## Main Question or Discussion Point

Hello! I made a linear fit, ##y=ax+b##, to some data points and I get the best parameters with their (1 sigma) errors: ##a\pm\delta a## and ##b\pm\delta b##. I want to plot this fit on top of my data points in such a way as to reflect the error on the parameters. The "main" fit is simply ##y=ax+b## with the parameters obtained from the fit, but I would like 2 more lines as un upper and limit to that (like a 1 sigma band). What formula should I use for the upper and lower lines associated to the boundaries of this band? Thank you! (I would like something like this, although I am not sure why their band is curved)