PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/02-20:28:00
G01     75.0           33.3               13.1 +/-    0.63      21.4 +/-    0.63  0.090 / 0.240
G07     135.3          34.7               14.4 +/-    1.11      23.0 +/-    1.11  0.100 / 0.250
G11     57.2           34.1               10.1 +/-    0.79      16.3 +/-    0.79  0.060 / 0.100
G13     279.3          37.7               13.8 +/-    0.90      20.8 +/-    0.90  0.060 / 0.100
G15     305.7          14.4                8.7 +/-    2.39      21.8 +/-    2.39  0.040 / 0.080
G17     227.2          61.7               16.9 +/-    0.78      18.9 +/-    0.78  0.030 / 0.090
G18     52.3           20.1               10.2 +/-    0.78      22.4 +/-    0.78  0.030 / 0.050
G19     221.7          37.7               15.5 +/-    0.99      23.5 +/-    0.99  0.030 / 0.050
G28     13.9           60.0               11.2 +/-    0.46      12.7 +/-    0.46  0.050 / 0.110
G30     131.4          63.8               13.7 +/-    0.41      15.1 +/-    0.41  0.050 / 0.130