T>fnosep</TT> is the frequency of the thermostat in THz, that should be
chosen to be comparable with the center of the vibrational spectrum of
the system, in order to excite as many vibrational modes as possible.
<TT>tempw</TT> is the desired average temperature in Kelvin.

<P>
<EM>Note:</EM> to avoid a strong coupling between the Nos&#233; thermostat 
and the system, proceed step by step. Don't switch on the thermostat 
from a completely relaxed configuration: adding a random displacement
is strongly recom