X-axis compression in Excel

[skylark53]

Am adding a single data point 19 months after the last plotted point of a 1-year sequence of monthly data.

Question is, how do I introduce a break (sometimes depicted with //) in the x-axis to remind the reader that these data have a gap in them?

I also do not want to join this last point on to the other 12. That is, I want to 12 to be joined up, but not the 13th.

Cheers, Alison