Slowly, Double(!) click that point and then upon the third click hold the
left mouse button pressed while dragging.
You may need a few trials to find the correct clicking intervals.
Micky


"Mike" wrote:

Hi everyone,

I know it is doable because I have used it before. Say you did plot
some data points. You can then grap a single data-point on the curve,
you can then move it up or down (tweaking), and as you do so its
numeric value changes accordingly..

Does anyone know how to do this?

Thanks
.