Bar graphs at bottom of cards

I searched “bar graphs” to learn more about how the graphs are calculated and I see different information.
Specifically, How are ballpark home run effects calculated? I see some old posts that the graphs are calculate at 0,0,0,0.
I see more recent posts that seem to say otherwise.
I was not a SOM player using the cards. Only the PC game and now som 365. So I rely on the graphs.
Specifically, How are ballpark home run effects calculated? I see some old posts that the graphs are calculate at 0,0,0,0.
I see more recent posts that seem to say otherwise.
I was not a SOM player using the cards. Only the PC game and now som 365. So I rely on the graphs.