I'm trying to plot data which has decimal values for its x-axis, but the chart shows the point index rather that the x value , is there any way
to fix this?

example Data:

AGE    VALUE
20          0.5
25          0.4
30          0.3
35          0.2

The chart will have on its x-axis 1,2,3,4, rather than 20,25,30,35