When the CV of a test is equal to the Graph Against CV, the circle appears uniformly grey and does not have a pupil.
When the CV of a test and the CV of a Graph Against data set are not equal, their relative CVs are represented as two concentric circles.
The smaller inner circle (or pupil) represents the group with the smaller CV. The laboratory's pupil is black or colored.
The smaller inner circle (or pupil) represents the group with the smaller CV. The Graph Against pupil is white.
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