What is the parameter ‘km_foot’?

[chalkchalk]

Find that the parameter km_foot in code
Eigen::Vector3d force_tgt = state.km_foot.cwiseProduct(state.foot_forces_kin.block<3, 1>(0, i));
Where
km_foot = Eigen::Vector3d(0.1, 0.1, 0.1);
What does this parameter represent？Why not adjusting parameter kp_foot and kd_foot instead?

[ShuoYangRobotics]

Just another gain appears during swing leg controller derivation. I may add a document later to explain it. For now you can consider it as a scaling factor of target swing force