This page discusses units for all relevant files.
File
Units
fm_setup.in
Property
Value
Mass
g/mol
Charge
e
Distance
Angstrom
*.xyzf
Position
Energies
kcal/mol
Forces
H/B
Stresses
GPa
b.txt & force.txt
kcal/mol/Angstrom
kcal/mol/Angstrom^3