[nygbook]

Hello foamers
I use sample to write a surface value that grid is 80*80. So the number of surface value is 6400. However, I discovery the number of surface value is 12800. The sampleDict is below

surfaceFormat     raw;
interpolationScheme cell;

surfaces
(
    constantPlane
    {
        type            plane;    // always triangulated
        basePoint       (0 0 0);
        normalVector    (0 0 1);

        //- Optional: restrict to a particular zone
        // zone        zone1;
        interpolate     false;
    }
    
);

Anybody can give me some suggestion?