SPRING K

The parameter SPRING_K defines force constants $\kappa_{\mu}$ for the harmonic bias of the following form: $\tilde{V}(\xi_1,\dots,\xi_{M_8}) = \sum_{\mu=1}^{M}\frac{1}{2}\kappa_{\mu} (\xi_{\mu}(q)-\xi_{0\mu})^2 \;$ The