Bond coefficients in bond_style harmonic

Dear all,
I would like to know what are the three numbers in the bond coefficients for bond_style harmonic, since there are only two factors in the formula.

The clip from the documentation page is attached with this email

Regards,

Screenshot 2018-07-16 04:53:54.png

Dear all,
I would like to know what are the three numbers in the bond coefficients for bond_style harmonic, since there are only two factors in the formula.

​please read ​
https://lammps.sandia.gov/doc/bond_coeff.html

Bond type, bond stiffness & equilibrium bond length.

Sanjib