
| <mask in> | Input mask file (1 or 0) |
| <mask out> | Output mask file (0-n depending on symmetry) |
| sym=<symmetry> | Standard symmetry specification |
| [xtend=<n shells>] | Expand the masks iteratively after symmetrization (very slow) |
| [maskdata=<volume in>] | This will mask out the individual subunits,align them and save them to MRC files |