PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-19:27:50
G01     110.6          23.7               12.3 +/-    2.33      24.7 +/-    2.33  0.180 / 0.110
G07     100.5          61.3               10.7 +/-    0.61      12.0 +/-    0.61  0.250 / 0.120
G08     42.9           26.4                8.0 +/-    2.63      15.2 +/-    2.63  0.110 / 0.150
G09     175.9          17.3               13.1 +/-    1.52      30.9 +/-    1.52  0.110 / 0.160
G11     95.8           42.7               10.7 +/-    0.94      15.0 +/-    0.94  0.080 / 0.130
G13     312.4          26.1               10.0 +/-    1.62      19.0 +/-    1.62  0.090 / 0.150
G17     205.7          30.4               12.3 +/-    1.06      21.4 +/-    1.06  0.030 / 0.040
G18     84.8           23.7                9.3 +/-    1.30      18.8 +/-    1.30  0.030 / 0.030
G28     311.4          60.4                9.3 +/-    1.07      10.5 +/-    1.07  0.020 / 0.020
G30     15.6           76.4               10.2 +/-    1.01      10.5 +/-    1.01  0.020 / 0.020