I agree with Mickael that this is also a good and very disk space aware of storing the data. If we store the internal faces and the (external) boundaries in separate sections for each family we could also leave out the neighbor cell information for the boundaries. This would save even more space.
When designing the output file please make the field and the separate boundary families accessible by using a multi-block like approach. This would make ParaView even more usable for out team.
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