PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-15:27:50
G01     60.5           30.7                7.4 +/-    1.10      12.8 +/-    1.10  0.040 / 0.040
G07     142.1          22.6                9.8 +/-    1.67      20.2 +/-    1.67  0.040 / 0.050
G11     48.1           23.4                6.6 +/-    1.80      13.3 +/-    1.80  0.060 / 0.130
G13     262.7          35.4               10.0 +/-    1.62      15.7 +/-    1.62  0.070 / 0.130
G15     296.7          15.3                4.0 +/-    2.21       9.9 +/-    2.21  0.070 / 0.120
G17     258.3          76.3                9.2 +/-    0.54       9.4 +/-    0.54  0.080 / 0.130
G18     42.3           12.8                6.0 +/-    1.57      15.7 +/-    1.57  0.040 / 0.090
G19     231.7          47.3               10.1 +/-    2.55      13.2 +/-    2.55  0.060 / 0.070
G28     35.0           56.8                8.3 +/-    1.21       9.7 +/-    1.21  0.330 / 0.210
G30     143.7          53.6                8.4 +/-    0.60      10.1 +/-    0.60  0.220 / 0.290