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. 2019 Oct 1;6:189. doi: 10.1038/s41597-019-0199-y

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© The Author(s) 2019

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Fig. 3 — Methodology applied for calculating the COP time series. Spatial temperature time series from the ECMWF ERA-Interim dataset are combined with COP curves based on manufacturer data⁹ to calculate the temperature difference between various heat sources and sinks. After spatial aggregation, the time series are corrected with respect to field measurements¹⁰.