
Grid Size:
Horizontal Size  specifies the horizontal resolution of the rectangular grid over which surface
and ZColor functions are evaluated. 
Grid Size:
Vertical Size  specifies the vertical resolution of the rectangular grid over which surface
and ZColor functions are evaluated. 
Fit:Linear
Interpolation  linearly interpolates surface and ZColor functions across
rectangular grid cells. 
Fit:ThinPlate
Smoothing Spline  fits surface and ZColor functions over the
rectangular grid using thinplate smoothing spline fitting. The
process may be much slower than linear interpolation. It usually
produces very smooth surfaces and colors.

Number of
Contour Levels  specifies the number of contour levels
to be drawn on the surface. The contour levels are spaced evenly
within the range of the ZColor variable, or the range
of the Z variable if no ZColor variable is specified. 