From one of the images
Quote:
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Toronto's home run rate on contact was 5.4 percent at home in 2010, meaning Rogers Centre boosted the Jays' rate by 1.8 percentage points, or about 50 percent. Their opponents' rate was 0.2 percentage points less than at a neutral park.
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The second value is purely just trying to make something up, while the former just acknowledges the fact that the Blue Jays were a power hitting team in 2010.