How can I plot data points on time axis proportionally to time scale?

[gib65]

Hello,

I have a graph that plots time against "levels" (see attachment).

On the time axis, it spaces the data points apart by the same amount regardless of their value. For example, as you can see in the attached spreadsheet, the data points at 5:30 and 11:15 are spaced apart by the same amount as the data points at 11:15 and 12:00 even though the first is a 5 hours and 45 minute difference and the second is only a 45 minute difference.



What I would like to do is space the data points apart in proportion to the difference in the values. In other words, the first and second data points should be almost 8 times the distance apart as the second and third data points.

How can I get Excel to space out the data points in proportion to the difference in the values?

Thanks.