Plot any team-season or player-season against any stat in the library. Pick the pool on the left, the stats and chart type below it — the address bar always holds a link to exactly what you're looking at.
Markers are team logos. Index stats (SP Strength Index, Unit grades) are computed per season — a past season's index is the solve as it stood at the end of that season.
Ring color: the halo around each logo is colored by the fourth stat on the scale at the right — deep blue is the high end, pale is the low end (for a lower-is-better stat the scale is flipped, so deep blue is still the good end).