2   5  7   11
    - --- -- ---- -----
   |X|   |  |PREV|     |
    - --- -- ---- -----
       |  |   |     |
       |  |   |     |_(1)Timestep increment(I5)
       |  |   |
       |  |   |_Compulsory Data Record Keyword(A4)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on last data record in Data Category (A3)

(1) The timestep increment determines how often the full printout of positions and forces is printed to the output listing file. For example, if the timestep increment was five then the printout would contain information on each structure at timesteps 1,6,11,16 etc. This facility can be used to limit the size of the printout to a manageable size for long simulations.

Note that recording of positions and forces in the graphics file is independent of the parameter on this data record. See the GREV data record for more information.