KEOGRAMS: The keograms are created from North-South directed slices through the centre of the ASK images that are stacked in time. The keograms are created for both the N2 (673 nm) and OI (777 nm) ASK channels, as indicated in the filename, and each keogram spans 20 min. The start date and time of the 20 min interval is stated both in the title of the keogram as well as in the filename. Three intervals are from 22 October 2006, and one interval is from 19 January 2007. The data for the statistical study in the paper came from these intervals.  
 
VIDEOS: The videos show ASK IN2 data from two three-minute time intervals, covering the same time intervals as the data shown in Figure 2 and 4 in the paper. The temporal resolution is reduced to 125 ms (raw data has a resolution of 31.25 ms), and the videos are played back at twice real speed. The time intervals  of the two videos are 23:41:00 - 23:44:00 UT on 22 October 2006, and 22:31:00 - 22:34:00 UT on 19 January 2007.