Add Limit Bar or region to a 2D plot

[dsicking]

Often data plotted or functions have end uses which showing acceptable range is importand. Older versions allowed entering a constant function among the traces. Mathcad 14 doesn't seem to do this. How does one accomplish the function?

[RichardJ]

Do the markers not do what You need?

[AndyWesterman]

Can you give an example of the format that you would like to achieve?

A picture would probably suffice ,but a few words to explain might be helpful.