[R] How to show a specific value of a ggplot2

[Neha gupta]

I have a ggplot2 which has x-values 0-200 and y values 0-10

p=plot(mydata)
p+xlim(0, 200)

I want to show what is the y value when we have 75 as x value. The graph
which is displayed has a broad range (like 0-50, 50-100 etc on x axis) and
cannot determine the exact value of y at the value of 75 on x-axis.

Thank you

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