The first chart lists push frequencies ATS. In other words, for a spread of, say, ±3, the first chart indicates that there is a roughly 3.91% frequency that bet pushing. This can be extrapolated upon, so that one might say that for a spread of about ±3, there is a roughly 3.91% frequency of the favorite winning by exactly 3 points.
The second chart is simply a margin of victory chart. It indicates the historical frequency of the winning team's margin of victory being as specificed.
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