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2012 SIGMA results - Perfect147days - Tartu

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## 2012 SIGMA results - Perfect147days - Tartu

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**SIGMA measurementsfrom april 2010 to november 2011Urban air**above the roof of a 4-storey building Tähe 4, Tartu, Estonia Contour plots for 147 days, which satisfy the requirements: uninterrupted diurnal set of 288 five-minute records, no considerable disturbances and low instrumental noise.