Question about diag

[kate]

The diag routine prints summary information:

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   STEP   Day HH:MM:SS  KINETIC_ENRG   POTEN_ENRG    TOTAL_ENRG    NET_VOLUME
          C => (i,j,k)       Cu            Cv            Cw         Max Speed

  17127 36516 22:18:00  1.956347E-03  2.035685E+04  2.035685E+04  1.034739E+15
          (008,353,50)  2.498817E-02  1.174760E-02  0.000000E+00  1.038600E+00

Sometimes one or two of the Cx numbers get reported as zero:

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  17128 36516 22:18:40  1.956649E-03  2.035685E+04  2.035685E+04  1.034739E+15
          (383,331,15)  8.941172E-04  1.527153E-03  7.197013E-01  1.039028E+00
  17129 36516 22:19:20  1.956860E-03  2.035685E+04  2.035685E+04  1.034739E+15
          (455,289,06)  0.000000E+00  0.000000E+00  1.073485E+00  1.039252E+00

I haven't managed to figure out how the mp_reduce2 routine works at all, much less why it sometimes gives zero or what the zeroes mean. What do they mean?