Left panel: traces of the primary (red) and secondary (blue) stellar images observed at Bootes-3, as deduced from Fig. 5. The arrows indicate the direction of motion. “Ingress” (resp. “egress”) refers to the disappearance (resp. re-appearance) of the images into the atmosphere of Pluto. The diamond-shaped symbols mark the positions of the image at the peak of the flash, corresponding to the time of closest approach of the respective station to the shadow center. In total, the primary image scanned longitudes from 120 to 270°, while the secondary image scanned longitudes from 310 to 360° and then from 0 to 70°. The brace indicates the total duration of the primary flash (~15 s, see Sect. 4) at Bootes-3, covering a relatively large region of more than 120° in longitude. A similar extension applies to the secondary flash, but the brace has not been drawn for sake of clarity. The black bullets are the locations of the REX measurements at entry and exit (Hinson et al. 2017). We note the casual proximity of the REX points and the 2015 June 29 flash peaks. Right panel: same as in left panel but for the Dunedin station, where the brace has not been repeated. We note that the tracks and motions of the primary and secondary images are essentially swapped between the two stations.