Chart FX question

Tutankamon

I have created a plot using "chartfx " function (Borland builder 6 Enterprise) with a data set (for example [5 10], [10 20], [15 30] where 5, 10 and 15 are x values to be displayed on the horizontal axis and 10,20 and 30 are y values to be displayed on the vertical axis)- However, on the horizontal axis, the chart displays "1 2 3 ..." instead of x values (i.e. 5, 10, 15).

How can I display these values?

Many thanks...