tokens: We thank Tiago Pereira for his help during the observations. Comments from the referee led to considerable improvement of the presentation. IRIS is a NASA small explorer mission developed and operated by LMSAL with mission operations executed at NASA Ames Research Center and major contributions to downlink communications funded by the Norwegian Space Center through an ESA PRODEX contract. The SST is operated on the island of La Palma by the Institute for Solar Physics of Stockholm University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. This research received funding from both the Research Council of Norway and the European Research Council under the European Union’s Seventh Framework Programme (FP7/20072013)/ERC grant agreement No. 291058. We made much use of the SolarSoft and ADS libraries.
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