Originally Posted by
Turnup
You can plot the data points in 2D using the scattergram type graphical function (chart) in Excel.
Superimposing a circle of arbitrary size and origin is quite trivial. Calculate x,y co-ords of a circle at suitable intervals. Take circle size as a fill in box and add an x and y offset fill in box as inputs to the calculation. Plot the points on the same chart. in a different colour. Change circle size and offsets to move it about and tweak until you get the best visual fit.