#define ATOM_ATTR_2BP 0x20 /* pair potential */
#define ATOM_ATTR_3BP 0x40 /* 3 body potential */
+#define DEFAULT_ATOM_ATTR 0x74 // 1,2,3 body interaction + visualize
+
/* cell lists */
typedef struct s_linkcell {
int nx,ny,nz; /* amount of cells in x, y and z direction */