ANDERSEN_PROB

In molecular dynamics with an Andersen thermostat (MDALGO=1$\vert$11), the temperature is maintained via random collisions of atoms with the heat-bath. The collision probability defined as the average number of collisions per atom and a time-step can be specified using ANDERSEN_PROB:

ANDERSEN_PROB=$0 \leq$ [real] $\leq 1$

Default
ANDERSEN_PROB=0

Obviously, the setting ANDERSEN_PROB=0 (i.e. no collisions with the heat-bath) generates microcanonical ($NVE$) ensemble.