for ewald we also have evflag_atom that needs to be initialized

  void pair_check();

  void ev_init(int eflag, int vflag, int alloc = 1) {

    if (eflag||vflag) ev_setup(eflag, vflag, alloc);

    else evflag = eflag_either = eflag_global = eflag_atom = vflag_either = vflag_global = vflag_atom = 0;

    else evflag = evflag_atom = eflag_either = eflag_global = eflag_atom = vflag_either = vflag_global = vflag_atom = 0;

  }

  void ev_setup(int, int, int alloc = 1);

  double estimate_table_accuracy(double, double);