Fig. 4.

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The IMFs of the colour index [FUV-MUV] are shown from the first (highest frequency) to the last (lowest frequency) starting from the top. The datasets cover the time between May 2003 and October 2015. IMF4 corresponds to the 11-year Schwabe cycle, while the bottom panel, labelled “res.”, represents a residual trend most likely due to ageing effects on SOLSTICE data.
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