The READ command is used for reading data structures from a file into the analysis facility. AVV is the AV Velocities. PAX is the Principal Axis X, and PAV is the Principal Axis Velocities. The UNIT operand must be specified and gives the unit number where the data structure should be read. The format of the files which are written is very simple.
All data is in binary.
What follows is the data structure with its own control information. The dynamics averages data structures may be specified as with the READ command. If left out, the main structure is used. COOR is the coordinates. The UNIT operand specifies what Fortran unit the file should be written to.