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One thing I did notice is that the colour scales have labels centred beneath them. But the population densities in the labels are the bounds between two labels, so the labels should be centred on the colour boundaries.

This is something you see a lot with histograms, because the Excel default is that you must have labels under the columns. I hand roll histogram labels for this reason, placing them under the boundary between two columns.


Derek: good point. Was wondering if those numbers were boundaries or midpoints.

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