int procneigh[3][2];              // my 6 neighboring procs

  int nswap;                        // # of swaps to perform

  int need[3];                      // procs I need atoms from in each dim

  int maxforward_fix,maxreverse_fix;   // comm sizes called from Fix,Pair

  int maxforward_pair,maxreverse_pair;

  int maxforward_fix;               // comm sizes called from Fix,Pair

  int maxreverse_fix;

  int maxforward_pair;

  int maxreverse_pair;

  double cutghost[3];               // cutoffs used for acquiring ghost atoms

  Comm(class LAMMPS *);