Plotting individual points on a TGraph?

Using, a TGraph (well, at least I think a TGraph would be best here), how do I go about plotting individual points? By individual points, I mean that I want to plot locations on a coordinate plane as single dots, no curves connecting the points. I’ve tried a few things, but no matter what I get a line fitted to my graph.

Additionally, is it possible to add “lines” (for lack of a better word) to a TGraph? As in, horizontal and vertical lines, purely for viewing purposes, as with, say, a sheet of graph paper?

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Just don’t include “L” or “C” when you draw the graph, e.g.


To draw a grid on the pad, you can add:


after creating the canvas; where exactly you do this may vary depending on whether you are creating your own pads.