I know this is too elementary, but go from here:
You have a scatter chart from A1:B6
(X A1:A6; Y B1:B6)
10 3
11 4
12 5
13 6
14 7
15 8
A 2nd source series is A8:B9
(X A8:A9; Y B8:B9)
13 0
13 6
giving you the a vertical line at X=13.
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