PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-12:27:40
G01     91.8           31.4                3.5 +/-    0.92       6.0 +/-    0.92  0.020 / 0.020
G07     124.2          46.6                4.2 +/-    0.93       5.5 +/-    0.93  0.020 / 0.020
G11     68.9           39.5                3.5 +/-    1.39       5.1 +/-    1.39  0.040 / 0.050
G13     295.9          35.8                3.9 +/-    3.32       6.1 +/-    3.32  0.050 / 0.050
G17     213.0          53.8                4.9 +/-    0.89       5.9 +/-    0.89  0.070 / 0.080
G18     64.6           23.8                3.3 +/-    0.73       6.7 +/-    0.73  0.070 / 0.070
G19     214.2          22.4                4.6 +/-    2.47       9.6 +/-    2.47  0.080 / 0.090
G28     345.7          61.8                2.5 +/-    0.73       2.8 +/-    0.73  0.090 / 0.090
G30     93.8           78.6                4.3 +/-    0.56       4.4 +/-    0.56  0.070 / 0.110