PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-17:57:40
G01     112.4          22.6               11.0 +/-    1.29      22.7 +/-    1.29  0.090 / 0.090
G07     97.0           62.5               11.1 +/-    0.65      12.3 +/-    0.65  0.110 / 0.150
G08     43.1           26.9                8.1 +/-    1.45      15.1 +/-    1.45  0.020 / 0.020
G09     175.9          18.6                9.9 +/-    1.79      22.4 +/-    1.79  0.030 / 0.030
G11     97.7           42.3               11.2 +/-    0.63      15.6 +/-    0.63  0.030 / 0.040
G13     313.6          24.9               10.4 +/-    1.01      20.4 +/-    1.01  0.040 / 0.020
G17     204.7          29.6               11.4 +/-    1.90      20.1 +/-    1.90  0.040 / 0.050
G18     86.6           23.3               10.1 +/-    1.24      20.5 +/-    1.24  0.040 / 0.060
G28     307.5          59.9               10.1 +/-    1.01      11.4 +/-    1.01  0.110 / 0.180
G30     6.4            75.0               11.8 +/-    0.45      12.2 +/-    0.45  0.090 / 0.150