In the MLB, when it says the pitch and the pFX, what is the pFX?

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The "Pitch-f/x" value is currently defined as the measurement of
the distance between the location of the actual pitch thrown over the
plate, and the calculated location of a ball thrown by the pitcher in
the same way, with no spin, The new Break value, which is
more appropriate for the common understanding of the term, is defined
as the measurement of the greatest distance between the trajectory of
the pitch at any point between the release point and the front of home
plate, and the straight line path from the release point and the front
of home plate. By this definition, a Barry Zito curveball will have a
much greater Break value than a Brad Penny fastball.

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