Benchmark solution
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Calculation method used for the reference solution
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For field :math:`\mathit{ch1}`, calculated on mesh :math:`\mathit{ma1}`, the reference solution is obtained with *Code_Aster* (version 5.02.07).

For field :math:`\mathit{ch1bis}` obtained by a "round-trip" projection (:math:`\mathit{ma1}\to \mathit{ma2}\to \mathit{ma1}`), the reference solution is field :math:`\mathit{ch1}`.

We thus measure the error due to the 2 successive field projections: :math:`\mathit{ch1}\to \mathit{ch2}\to \mathit{ch1bis}`