Clarification for FIRST manual/blueprint discrepancy

Please clarify the measurements for the side rail section. In the manual, under “the playing field”, it states the alleys by the sides of the platform are divided at midfield by a pipe barrier whose top is 1’4" above the floor. However, it doesn’t specify the bottom, or clearance of the bar.
On the BLUEPRINTS, there are two seperate measurements: one 16" and one 20". Please clarify the exact measurements of the entire sidebar.

I posted this at the FIRST forum. Has anyone else noticed this?

–Petey

According to measurements taken at Kickoff, the clearance comes to be about 14 5/16" I did not take these measurements, this is just what others have posted.