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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 3861 To link to this article: doi.doi:10.1149/1.3207589 fatcat:a6ci25umvzf6fljdl2zzqy7ni4