When a shooter like Stephen Curry crosses half court, defenders shade toward him before he touches the ball, and his teammates get cleaner looks because of it. That pull is what analysts call gravity. Measuring it normally takes the league's camera-tracking system. We wanted the number without the cameras.

Our version is built from reconstructed lineups: we rebuilt over a million five-man stints from play-by-play, joined every shot's location, and asked one question. How much better is the shot diet of a player's teammates while he is on the floor, in expected points per 100 shots?