I have two columns of figures, Thickness and Time, as the first row of each. (cooking times BTW)

In each column I enter a series of numbers, with the thickness in the column 1 and required time in column 2.

I then select both columns and Insert Chart, and just as I expect it pops up and a Column type chart. But then as distinct from what I expect and what Youtube showed me (https://www.youtube.com/watch?v=YskcMMEfxZs), instead of getting a chart of Time vs Thickness, I get *2* series, one for the times and one for the thickness. Both series lines are straight lines and I know this is not true.

The Thickness numbers are there, so the Y axis is 20 30 40 50 60 70. But the x axis is the numbers 1 to 6, which is simply a count of the number of rows.

I am very confused. Any help appreciated.

Nick