MFC
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Old Silo output metadata
See https://github.com/MFlowCode/MFC/blob/a8a3103e849809b6f80e72e0d6f71578e7256645/src/post_process/m_data_output.fpp#L445 and https://github.com/MFlowCode/MFC/blob/a8a3103e849809b6f80e72e0d6f71578e7256645/src/post_process/m_data_output.fpp#L466
Not sure if a string is needed there, maybe can be replaced by an empty string.