PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-09:27:50
G01     115.0          20.7                5.5 +/-    1.41      11.9 +/-    1.41  0.040 / 0.040
G07     92.6           63.3                5.0 +/-    0.97       5.5 +/-    0.97  0.040 / 0.030
G08     42.9           25.6                3.7 +/-    0.66       7.1 +/-    0.66  0.030 / 0.050
G09     173.0          17.1                4.9 +/-    2.13      11.6 +/-    2.13  0.020 / 0.040
G11     98.8           41.5                6.2 +/-    0.97       8.8 +/-    0.97  0.090 / 0.160
G13     315.1          23.3                3.2 +/-    2.29       6.5 +/-    2.29  0.100 / 0.160
G17     202.2          30.9                5.0 +/-    2.43       8.6 +/-    2.43  0.090 / 0.210
G18     87.8           22.2                4.4 +/-    2.73       9.1 +/-    2.73  0.080 / 0.210
G28     299.7          58.5                4.4 +/-    0.75       5.1 +/-    0.75  0.110 / 0.250
G30     351.4          71.5                6.6 +/-    0.53       6.9 +/-    0.53  0.110 / 0.230