So I’m obtaining the following graph:

`graphicDelayZOOM = LogLinearPlot[GroupDelay /. w -> 2 \[Pi] f, {f, 10, 3000}, PlotRange -> {{100, 3000}, {0.000116, 0.0001201}}, PlotPoints -> 200, PlotStyle -> {{AbsoluteThickness[1.5], RGBColor[1, 0, 0]}}, GridLines -> Automatic, FrameLabel -> {"f(Hz)", "time"}, Frame -> True, BaseStyle -> {FontFamily -> "Times", FontSize -> 12}] `

Now I want to display the point f1=2000, GroupDelay(f1). Is there any easy way to do it?