Colour-deficiency test, shifted spectra
In each of the four quadrants of the test, you are looking at
6 3 5
9 5 8
5 9 10
Colour balance in each quadrant has been adjusted:
no red [upper left], exaggerated red [lower left], exaggerated green [upper right], no green [lower right].
no red [upper left], exaggerated red [lower left], exaggerated green [upper right], no green [lower right].