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GRAFIC File format

by Aubert Dominique (Tuesday 20 June 2006)

GRAFIC1 files are little endian unformatted Fortran files. In these files, the seven fields (ic_deltab, ic_velbx/y/z, ic_velcx/y/z) are described on a regular grid.

The seven outputs follows the same structure:

  • A header: a single reccord which contains
    • np1,np2,np3 : 3 integers describing the size of the grid along the 3 directions
    • dx : the size of a grid element in Mpc/h
    • x1o,x2o,x3o: the coordinates of the grid’s origin
    • astart: the initial scale factor
    • omegam, omegav: the density parameters
    • h0 : the hubble constant
  • The ICs data: it consists in np3 reccords of np1*np2 matrix, i.e. ICs are organised in layers along the z-direction. This feature can be easily used to spare memory usage when these files are manipulated, since layers can be uploaded sequentially in memory. Velocities are in km/s while density is expressed in terms of density contrast.

The following Fortran example shows how to read such files:

White Noise files follow the same data structure, with a different header format. The header stands as a single record which contains the following variables:

  • np1,np2,np3 : 3 integers describing the size of the grid along the 3 directions.
  • iseed : 1 integer coding the seed of the random generator

Subsequent layers are organised in the same way as the density and velocities fields.

Click here for to download softwares for IC’s manipulation