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Section Mesh
Type float

The spacing between the points in the mesh. This controls the quality of the discretization: smaller spacing gives more precise results but increased computational cost.

When using curvilinear coordinates, this is a canonical spacing that will be changed locally by the transformation. In periodic directions, your spacing may be slightly different than what you request here, since the box size must be an integer multiple of the spacing.

The default value is defined by the image resolution if BoxShape = box_image. Othewise here is no default otherwise.

It is possible to have a different spacing in each one of the Cartesian directions if we define Spacing as block of the form

  spacing_x | spacing_y | spacing_z

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