#define MAXDIM 3
#define forever for(;;)

typedef float Real;

struct gas_particle {
    Real mass;
    Real pos[MAXDIM];
    Real vel[MAXDIM];  
    Real rho;
    Real temp;
    Real hsmooth;
    Real metals ;
    Real phi ;
} ;

struct gas_particle *gas_particles;   

struct dark_particle {
    Real mass;
    Real pos[MAXDIM];
    Real vel[MAXDIM];
    Real eps;
    Real phi ;
} ;

struct dark_particle *dark_particles;

struct star_particle {
    Real mass;
    Real pos[MAXDIM];
    Real vel[MAXDIM];
    Real metals ;
    Real tform ;
    Real eps;
    Real phi ;
} ;

struct star_particle *star_particles;

struct dump {
    double time ;
    int nbodies ;
    int ndim ;
    int nsph ;
    int ndark ;
    int nstar ;
} ;

struct dump header ;