The explanation is on page 22 of the Glossary.
Under "Computed Beaten Lengths," "F1" is determined by the horse's velocity for Fraction 1. "SC" is determined by the horse's velocity to the Second Call, i.e. Fractions 1 and 2. And "Fin" is determined by the horse's average velocity for the entire race, i.e. total distance divided by final time.
The "Incremental Match Up" is different. It's a visual representation of how the horses match up on velocity within each race segment. Think of it as three different races. Unlike Computed Beaten Lengths, it is not cumulative. "F1" is determined by the horse's F1 velocity. "F2" is determined by the horse's "F2" velocity only, not the velocity to the Second Call. And "TS + F3" is determined by averaging the horse's True Speed + F3 velocity.
For the projected winner (based on the selected paceline) and the cumulative beaten lengths, look at the "Fin" column under Computed Beaten Lengths.
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