int force_reneighbor;          // 1 if Fix forces reneighboring, 0 if not

  int box_change;                // 1 if Fix changes box size, 0 if not

  int next_reneighbor;           // next timestep to force a reneighboring

  int thermo_energy;             // 1 if ThEng enabled via fix_modify, 0 if not

  int thermo_energy;             // 1 if fix_modify enabled ThEng, 0 if not

  int nevery;                    // how often to call an end_of_step fix

  int rigid_flag;                // 1 if Fix integrates rigid bodies, 0 if not

  int virial_flag;               // 1 if Fix contributes to virial, 0 if not