PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-13:42:50
G01     116.2          19.9               10.3 +/-    1.06      22.6 +/-    1.06  0.040 / 0.020
G07     88.4           64.8                9.1 +/-    0.95       9.9 +/-    0.95  0.040 / 0.020
G08     43.6           28.0                6.7 +/-    1.90      12.2 +/-    1.90  0.040 / 0.030
G09     175.4          21.3                9.2 +/-    0.94      19.7 +/-    0.94  0.040 / 0.030
G11     101.7          41.1               10.1 +/-    0.58      14.5 +/-    0.58  0.140 / 0.190
G13     316.0          22.1                6.8 +/-    2.15      14.2 +/-    2.15  0.130 / 0.170
G17     202.4          27.9                8.4 +/-    2.33      15.4 +/-    2.33  0.110 / 0.150
G18     90.5           21.9                8.1 +/-    2.10      16.9 +/-    2.10  0.070 / 0.160
G28     298.5          58.5                8.5 +/-    0.97       9.8 +/-    0.97  0.120 / 0.220
G30     350.6          70.7                8.7 +/-    0.62       9.1 +/-    0.62  0.120 / 0.200