PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-12:28:10
G01     117.5          18.9                5.6 +/-    1.14      12.7 +/-    1.14  0.030 / 0.040
G07     88.2           63.1                4.0 +/-    0.54       4.5 +/-    0.54  0.020 / 0.040
G08     43.9           28.3                2.2 +/-    0.48       4.0 +/-    0.48  0.130 / 0.270
G09     174.8          22.1                4.0 +/-    2.44       8.3 +/-    2.44  0.110 / 0.300
G11     101.9          39.0                4.6 +/-    1.05       6.8 +/-    1.05  0.030 / 0.030
G13     318.0          18.7                1.5 +/-    1.21       3.4 +/-    1.21  0.040 / 0.040
G17     201.3          28.6                5.3 +/-    1.74       9.5 +/-    1.74  0.120 / 0.250
G28     296.2          57.9                2.4 +/-    1.40       2.8 +/-    1.40  0.100 / 0.260
G30     345.6          68.2                3.1 +/-    0.89       3.4 +/-    0.89  0.060 / 0.100