enter image description here

The above is a 2D histogram of y and z internal coordinates describing the positions of C-alpha atoms involved in hydrogen bonds between antiparallel Beta-strands.

There is no color coding. It is given as it is.

What can we assume about the data points if a histogram is circular?

When does a histogram take a circular shape?

[Note: "2D histogram" is a synonym for what bioinformaticians typically call heat maps, see here]



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