I have a plot that looks like this:

and what bothers me is that the center straight line is that long. The plot would look a lot better if I were somehow able to delete everything from -3 to 3. Is that understandable?
Thank you for your help. Here is my code for the center line:
Plot[sigma2[y], {y, -yT + h1/2, -yT + h1/2 + h2},
PlotStyle -> Thickness[.008], Frame -> True,
FrameLabel -> {StandardForm["Višina nosilca [mm]"],
StandardForm["Trdnost [MPa]"]},
PlotLabel -> HoldForm[Subscript[σ, 2] "(y)"]]
RegionFunctionspecification in yourPlot(e.g.RegionFunction -> Function[{x, y}, x < -3 || x > 3]) to preventPlotfrom displaying anything in that region of your plot. – MarcoB Oct 30 '15 at 12:19Abs[x] > 3to make that a little bit more compact. The answers in that post linked above need some tweaking to work with a discontinuous horizontal axis. – Jason B. Oct 30 '15 at 12:21