For this the snapshot is divided in concentric cylinders (i.e. the angular momentum axis is assumed to be along the Z-axis) of specified width. In each cylinder the mean velocity in the angular direction is computed (hence backward-moving particles are counted as negative), and with the total mass in a ring this gives the total bulk motion in the galaxy. If potentials are present in the snapshot, the total potential energy is also computed. Output contains time, bulk kinetic and potential energy.

**in=***snap_file*- Input file, in standard
*snapshot(5NEMO)*format. No default. **dr=***width*- Ringsize for binning radii. [Default
**0.1**] **rmax=***global_rmax*- If set, this will be the maximum radius used for binning. All particles outside this (cylindrical) radius will be discarded. Default: not used.
**w=**- Total
Potential energy of the external halo. Note this has to be of the same
sign as your potential values in the snapshot, in general NEMO uses negative
potentials [Default:
**0**]. **times=***t1,t2,...*- Times to select snapshot. Default: all.

snapkinem(1NEMO) , snapprint(1NEMO)

29-Oct-93V1.0 CreatedPeter 12-nov-93V1.1 added rmax= and allow non-equal size snapshotsPJT