Time-Line Network Ground arcs City a City B City c City d 8:0012:0016:0020:00 8:0012:0016:002000 2/212021 Barnhart 1.206J/16.77J/ESD. 15J2/21/2021 Barnhart 1.206J/16.77J/ESD.215J 9 Time-Line Network 8:00 12:00 16:00 20:00 8:00 12:00 16:00 20:00 City A City B City C City D • Ground arcs