Season ability — averaged across a season.
Ranked by racing every team's top seven in one hypothetical meet.
Positive is harder. +0.050 means a field runs about 5% slower here than the same field would on neutral ground — and because difficulty is applied after distance is normalised, a 5k and an 8k belong in one list. Ratings already give the difference back, so a slow time on a hard course is not a slow performance.
Raw times, uncorrected for course or conditions — a flat 5k beats the same effort on a hill. For a fair comparison use Ability.