Requirement of pair coefficient for Coul/long pair Style

Hi dear all,

I am using coul/long pair style in simulation. We know that Coulombic interaction potential in SI units are (q^2/(4piepsilon0*r)). If i use epsilon equal to 1. I want to know that pair coefficient value for this case is required to write or it is inbuilt in lammps ?.

Sandeep Kumar
Research Scholar