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4. Materials and services

EUR 1,000 2017 2016



Purchases during the period -1,280 -2,518
Increase/decrease in inventories 409 340
Materials and supplies -871 -2,179
External services -954 -2,518
Materials and services total -1,824 -4,697



During the period the write-down of inventories to net realisable value amounted to EUR 409 (-285) thousand.