Inside CUTOFF_RADIUS, the force constants are summed up in order to make dynamical matrix. Negative value has special meaning, which is that all the force constants are summed up if CUTOFF_RADIUS < 0 default -1.0 example
CUTOFF_RADIUS
CUTOFF_RADIUS < 0
default -1.0 example
-1.0
CUTOFF_RADIUO = 10.0