Click Concrete Design > Concrete Design Output > RC Beam Results to open the RC Beam Results table.

This table reports moments and required rebar areas at small increments along the length of the member.
fc and fy: Concrete strength and rebar yield strength.
Bot Mu: Moment producing tension on the bottom of the beam.
Bot As: Area of steel required to satisfy Bot Mu.
Top Mu: Moment producing tension on the top of the beam.
Top As: Area of steel required to satisfy Top Mu.
Tip: If Bot As or Top As indicate -1.0, that means that the section is too small for the loads.