Contains the three components of velocity at the Voronoi points. ( = number of cells) Size:

- Type: binary
- Format: (double ) for each time step.
- Matlab equivalent: u(1:Nkmax,1:3,1:Nc) for each time step.

Note: empty cells (beneath z=-d) contain value of `EMPTY`

defined in `suntans.h`

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2014-08-06