Position, position, position....
to call this one right, you've got to be in the right position, otherwise it's a best guess.
So, in addition to what others have said about the arc and the relative position of the players in relation to the sideline, I believe the most important mechanic is to position yourself straddling the sideline, still as stone, 10+ yards away (if possible) to get a good view of what is actually happening.
If you're like me, sometimes I get "happy feet" and get too close to the play and need to stop moving to make a good call. Darn it!
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