Values in the *.*erd file
 

I have a placed a wall boundary in order to measure the lift and drag forces over an airfoil but also the pressure. When I open the *.* erd file I don't know what are SX, SY forces, NX,NY forces and Pfav,Paav. In addition when it calculates Pmax is it relative pressure? Please help me because it is really important. Thank you for the help