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Change log for branch "pre38". 
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o cosine(latitude) scaling of viscosity and diffusion 
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 moved declaration of "cosFac" from calc_mom_rhs.F to GRID.h 
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 now calculated in ini_spherical_grid.F (set to 1 in ini_cartesian_grid.F) 
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 "Method III" (preferred) available for biharmonic term 
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 anisotropic (preferred) scaling available 
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 added scaling for diffusion (same features as for viscosity above) 
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x thought for the future: lateral GM/Redi fluxes are currently scaled. 
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If we scale them we would have to scale the other tensor components 
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in order to retain the adiabatic property of scheme. 