GALAXY(6)                                               GALAXY(6)

     NAME
          galaxy - representations of n-body simulations

     DESCRIPTION
          Files of this format are interpreted by galaxy(1) as
          describing the inital condition of n-body simulations or the
          saved state of simulation in progress.  A galaxy file is a
          UTF stream of instruction lines. The instruction is given by
          the first space delimited word. The following instructions
          are accepted.

          MKBODY
               The rest of the line must contain 5 white space delim-
               ited double-precision floating point numbers. They rep-
               resent a body's x coordinate, y coordinate, x velocity
               component, y velocity component, and size respectively.

          ORIG The rest of the line must contain 2 white space delim-
               ited double-precision floating point numbers. They rep-
               resent the current location of the origin with respect
               to the view window of galaxy(1).

          DT   The rest of the line must contain a double-precision
               floating point number which determines the time-scale
               of the simulation.

          SCALE
               The rest of the line must contain a double-precision
               floating point number which determines the scale of the
               view of the simulation.

          GRAV The rest of the line must contain a double-precision
               floating point number which determines the gravita-
               tional constant of the simulation.

     SEE ALSO
          galaxy(1)