Grid number question


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My plt file shows that:

     3      3
18 17 19
-0.35920E+01 0.49080E+01-0.30000E+01 0.50000E+01-0.37400E+01 0.52600E+01

That means there are 19 grid points in x direction, 17 grid points in y direction and 18 grid points in z direction. And the number of total grid points may be 19*17*18=5814.

But the grid file shows that:
      1208        0.0000000000
-2.3432602255 -2.8345889818 -5.8430327549 0.0164028207

Why only 1208 grid points in grid file, not 5814 grid points?