Fig. 3
EUV image of the NOAA 11642 active region. The blue triangles show the manually selected points of the analysed loop, which is fitted with an ellipse (white curve). Transverse slits perpendicular to the apparent loop path are shown with red lines. The slits were used for making time-distance plots. For the purpose of clarity, we show only 20 slits out of 100 analysed.
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