PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/27-12:42:50
G01     127.8          11.0               -3.4 +/-   37.95      -9.4 +/-   37.95  0.030 / 0.040
G07     49.5           69.6                6.1 +/-    0.44       6.5 +/-    0.44  0.030 / 0.040
G08     50.7           39.5                5.6 +/-    0.91       8.3 +/-    0.91  0.200 / 0.250
G09     176.8          35.4                6.5 +/-    1.43      10.2 +/-    1.43  0.140 / 0.310
G11     118.5          34.8                6.8 +/-    0.66      10.8 +/-    0.66  0.060 / 0.120
G13     321.3          11.0               -4.1 +/-   18.78     -11.3 +/-   18.78  0.050 / 0.100
G17     199.6          14.2                2.7 +/-    1.32       6.9 +/-    1.32  0.040 / 0.060
G18     104.4          16.1                6.4 +/-    1.10      15.4 +/-    1.10  0.050 / 0.080
G28     274.4          52.2                5.6 +/-    0.95       6.9 +/-    0.95  0.030 / 0.040
G30     330.4          58.8                3.9 +/-    0.77       4.5 +/-    0.77  0.030 / 0.040