Scot,
Very cool analysis and thanks for sharing!
While the numbers speak for themselves I'd add the following word. I'd caution people about reading too much into the scarcity order of ultra-rare backs from this study because even a 'find' of as small of 20-30 back types could significantly effect the percentage found of that backs (e.g. 0.02% vs. 0.04%)
However, for less rare series the numbers provide compelling stats on relative scarcity and population sizes.
Best Wishes,
Scott
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