Fig. 7
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K I VISred (left) and K I IRblue (right) spectra of 1RXS J114728.8+664405 (top) and EV Lac (bottom) during quiescence (grey lines) and flares (red and blue lines). In contrast to the K I VISred line, the K I IRblue line does not appear to react to flares. The double dip structure of the K I IRblue line is explained in Sect. 3.3.3.
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