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Table 2

List of oblique ionogram paths used here. The path length is the distance between transmitter and receiver. The sounding cadence of 5/10 min indicates that synchronised ionograms are produced alternatingly at five-minute and ten-minute intervals. The distances and azimuths to the eruption are calculated as in Table 1, from the midpoint of the oblique sounding path.

Transmitter Receiver Midpoint Path-length Cadence Distance Azimuth
PQ052 JR055 52.4°N, 14.0°E 518 km 15 min 16,123 km 31.4°
DB049 JR055 52.4°N, 8.8°E 780 km 5/10 min 16,285 km 23.2°
DB049 EB040 40.5°N, 2.6°E 1082 km 15 min 17,689 km 19.3°
EA036 EB040 39.0°N, 3.3°E 747 km 5/10 min 17,824 km 22.5°

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