How to draw family of curves using excel data?

I have a set of Excel data. The first column is x, the second column is y, and the third column is label, as shown in the figure. I want to draw curve families according to label classification. How should I do it? Thanks.

Answer 1

[Mingyuan Ma]

Note that the graph I want to draw is like this(vg doesn't need to be the same):

Answer 2

[Image Analyst]

Try plot() and yline(). Attach your data if you need more help.