# of timesteps 
    <LI>
    3rd parameter = file name for this routine's diagnostic output 
    <LI>
    4th parameter = # of remaining parameters (0 to 5) 
    <LI>
    5th-9th parameters = optional parameters to pass to user routine
</UL>
<PRE>
call a user-defined diagnostic routine every this many timesteps
this command can be used multiple times to call different routines
  at different frequencies, that use different parameters, and that
  send output to different files
value of 0 for 2nd parameter me