Thank you for your answer. I can see that for VTK there is the option of:
/DataOutBase::VtkFlags flags;/
/flags.write_higher_order_cells = true;/
/
/
I could not find anything similar for HDF5. When exporting the results and the mesh, I can only see the nodes corresponding to the first order, so I always get less dof than what I actually have. Is there any option to export all the corresponding dof?

I don't know whether it is possible at all in HDF5 to output higher order cells, but even if it is, it is probably not implemented. But you can always call DataOutBase::build_patches() with n_subdivisions>1. Take a look at the documentation of that function.

Best
 W.

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Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/

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