Table of Contents

Iterative determinations of the axis ratio, using the moments of inertia, have been implemented on an experimental basis.

**in=***snap_file*- Input data is read from
*snap_file*, which must be in*snapshot*(5NEMO) format. Default:*required*. **out=***snap_file*- Output data is written to
*snap_file*, in*snapshot*(5NEMO) format. Default:*required*. **weight=***body_weight*- Expression used to compute the weight of each
body. See
*bodytrans*(1NEMO) for the form of*body_weight*. Default:**1.0**. **rcut=***cutoff_radius*- If
*cutoff_radius*is greater than zero, only particles within*cutoff_radius*of the*body_weight*ed centroid will be used to compute the moment-of-inertia. Default:**0.0**. **times=***time_range*- Only frames within
*time_range*will be analyzed. Default:**all**. **shell=***r_min,r_max*- Two
*radii*are expected here. They define an ellipsoidal shell within which the (modified) inertia tensor is computed and iterated. Default: all particles. **iters=***max_iters*- Maximum number of iterations
allowed in computing the inertia tensor within a changing volume/shell.
Default:
**1**. **tol=***min_tol*- Minimum tolerance required to stop iterations. [Default:
**0.0001**] **modified=t|f**- Use modified inertia tensor? If set to true, the modified
(normalized w.r.t. the squared ellipsoidal radius from a previous iteraton)
inertia tensor is used instead of the regular one. Note that the
*body_weight*is also applied. It only makes sense to use this option if*max_iters*> 1. [Default:**f**]. **test=***snap_file*- If a filename is given, it is expected to be
a snapshot. The first snapshot in this file is used to rectify all selected
snapshots from the inputfile. Default: none.

Aguilar & Meritt (1990) - ApJ 354, 33. ` ` ` ` Using a fraction of the most bound
particles

Katz (1991) ApJ 368, 325. Volume iterative tensor.

Dubinski & Carlberg (1991) ApJ 378, 496. Volume iterative modified tensor.

Kuijken & Dubinksi (1994) MN 269, 13. Shell iterative modified tensor.

5-mar-89original version?JEB 4-jul-94finally implemented test=, also output theta/phi of p.axesPJT 24-jul-94V1.4 experimental iters=, shell=PJT 15-mar-02V1.4d addded log= keywordWD