Output files of plug-in-gait_simple model

kinematics
#1

Hello,

When I used my own C3D file to investigate the right knee reaction joint forces, there was 5 output in the

Right/Leg/Jnt/Knee/Constraints/Reaction/Fout
(Mediolateral Force, anteroposterior Force, ProximoDistal Force, Axial Moment and Lateral Moment).

Also, there are other fonder named RefFrameOutput which have 2 part: F and M.

I was wondering what the difference between them.

Any help would be appreciated.
Thank you!