mask_read [file name]
This commands reads in a mask from the external file system. Only one mask is stored in O at a time, so an earlier mask is over-written. From version 5.9.2, O can read a number of different mask formats: old O mask format, MAMA compressed format, and compressed or explicit OMASK format. Masks can be generated by a number of external programs, MAMA, Bones_mask or Pdb_mask.