PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-13:43:00
G01     116.2          19.9                9.9 +/-    0.89      21.7 +/-    0.89  0.040 / 0.030
G07     88.4           64.8                8.3 +/-    0.42       9.1 +/-    0.42  0.040 / 0.030
G08     43.6           28.0                5.8 +/-    1.15      10.6 +/-    1.15  0.110 / 0.160
G09     175.4          21.3                7.4 +/-    1.66      15.8 +/-    1.66  0.110 / 0.140
G11     101.7          41.1               10.0 +/-    0.50      14.4 +/-    0.50  0.030 / 0.040
G13     316.0          22.1                4.5 +/-    2.09       9.5 +/-    2.09  0.030 / 0.040
G17     202.4          27.9                7.3 +/-    1.76      13.3 +/-    1.76  0.040 / 0.060
G18     90.5           21.9                8.1 +/-    0.95      17.0 +/-    0.95  0.040 / 0.060
G28     298.5          58.5                6.6 +/-    0.84       7.6 +/-    0.84  0.050 / 0.100
G30     350.6          70.7                7.6 +/-    0.71       8.0 +/-    0.71  0.040 / 0.090