I have a series of x-y plots to make using Excel. All values of x and y are
in range +10 units to -10 units. However when I plot the data in Excel, the
plot is distorted as the physical size per unit on the the x and y axes is
not the same. How can I plot the data so that say 1unit is say 1cm long on
both x and y axes? In other words, if the data is for say an ellipse how do I
plot the data so that the output really is an ellipse?