Starlab version 4.4.1
    program created on May  6 2005 at 22:20:47
    source file     /home/steve/starlab/src/node/dyn/util/scale.C

(Re)scale an N-body system to specified M, Q (=T/U), and E.  Note
that if the required Q implies E > 0, no additional energy scaling
is applied.

Note: Only top-level nodes are considered in scale_virial and 
scale_energy.  Also, only internal positions and velocities
are modified -- the root pos and vel are left untouched.
Option "-s" is equivalent to "-M 1 -R 1 -Q 0.5".
For systems in which stellar data have been specified, the
physical mass, length, and time scales are already defined.
Normally those will correspond to the cluster mass, length,
and time units, so the "-s" option is probably most appropriate
in most cases.  This tool completes the connection between
properties and physical units.  In all cases, command-line
parameters are specified in N-body units.  As of 7/01, systems
with embedded tidal or other external fields are also properly
scaled (assuming that the Jacobi radius scales with the virial
radius).  Note that the virial radius is defined in terms of the
*internal* potential energy only.  For now, only allow the energy
to be specified if there are no external (non-tidal) fields.

Usage: scale [OPTIONS] < input > output

Options:    
             -c    zero the center of mass position and velocity [no]
             -d    debug mode [off]
             -e    specify softening parameter [0]
             -E    specify total energy [don't scale]
             -m/M  specify total mass [don't scale]
             -q/Q  specify virial ratio [don't scale]
             -r/R  specify virial radius [don't scale]
             -s/S  scale to "standard" units (-m 1 -r 1 -q 0.5) [not set]

Written by Steve McMillan.

Report bugs by starlab (at) sns.ias.edu.