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Fig. 3

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Enhanced distance-time map of the intensity (top panel), Doppler velocity (upper middle panel), and line width (lower middle panel) of the Ne viii 770 Å spectral line, and map of the line width (lower panel) of the N iv 765 Å spectral line. Propagating disturbances moving toward the limb are clearly visible in the top and middle panels and have a propagation speed of 60 ± 4.8 km s-1. White and black continuous lines in the top two panels are drawn to trace propagating disturbances with a period of 14.5 min. The bottom panel shows significant enhancements in line width at lower heights in the solar atmosphere at the base of the propagating disturbances (marked with ellipses).

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