Hi,
I wish to edit the color within the plot area from point A but they only
allow me to select the whole area and change.
Below is an example. I wish to color the area R in red. How to do about it?
I do have bubbles around the plot area but don't need to make any change to
them. I just want some good advice on the plot area. Will appreciate some
help here.

Y axis

5 Red (Area R)
4 ____________________
3 Yellow (Area Y)
2 ____________________
1 _______Green (Area G)_
A B C D

X axis


Thanks!