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This sets of parameters, contained in the namelist block &INIT_PARAMS. This is used to set up the initial conditions.

Variable name, syntax, default value	Fortran type	Description
`nregion=1`	`integer`	Number of independent regions in the computational box used to set up initial flow variables.
`region_type=square`	`10*char`	Geometry defining each region. `square` defines a generalized ellipsoidal shape, while `point` defines a delta function in the flow.
`x_center=0.0`	`real arrays`	X coordinate of the center of each region.
`y_center=0.0`	`real arrays`	Y coordinate of the center of each region.
`z_center=0.0`	`real arrays`	Z coordinate of the center of each region.
`length_x=0.0`	`real arrays`	Size in X direction of each region.
`length_y=0.0`	`real arrays`	Size in Y direction of each region.
`length_z=0.0`	`real arrays`	Size in Z direction of each region.
`exp_region=2.0`	`real arrays`	Exponent defining the norm used to compute distances for the generalized ellipsoid. `exp_region=2` corresponds to a spheroid, `exp_region=1` to a diamond shape, `exp_region>=10` to a perfect square.
`d_region=0.0`	`real arrays`	Density. For `point` regions this is used to define mass.
`u_region=0.0`	`real arrays`	X velocity. For `point` regions this is used to define velocity.
`v_region=0.0`	`real arrays`	Y velocity. For `point` regions this is used to define velocity.
`w_region=0.0`	`real arrays`	Z velocity. For `point` regions this is used to define velocity.
`p_region=0.0`	`real arrays`	Pressure. For `point` regions this is used to define specific pressure.
`filetype=ascii`	`20*char`	Type of initial conditions file for particles. Possible choices are `ascii` or `grafic`.
`aexp_ini=10.0`	`real`	This parameter sets the starting expansion factor for cosmology runs only. Default value is read in the IC file.
`multiple=.false.`	`logical`	If `.true.`, each processors reads its own IC file. For parallel runs only.
`initfile=`	`80*char`	Directory where IC files are stored.

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