Gerris is a system for the solution of the partial differential
 equations describing fluid flow.
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 GfsView displays the results of 2D and 3D Gerris simulations.
 A brief summary of its main features:
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    * Scalar and vector cross-sections.
    * Isosurfaces.
    * Streamlines.
    * User-defined functions.
    * Fast adaptive display (using the multiresolution data
      representation of Gerris).
    * Scriptable.
    * Offline image generation.
    * Quality PostScript, PDF and bitmap outputs.