PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-11:57:40
G02     201.3          21.7                4.5 +/-    2.47       9.4 +/-    2.47  0.130 / 0.120
G06     167.0          57.8                6.1 +/-    0.39       7.1 +/-    0.39  0.080 / 0.110
G13     223.7          11.4                4.0 +/-    2.04      10.9 +/-    2.04  0.050 / 0.040
G17     22.4           59.1                5.1 +/-    0.93       5.8 +/-    0.93  0.040 / 0.050
G19     338.4          70.4                4.3 +/-    0.60       4.5 +/-    0.60  0.040 / 0.030
G24     308.4          30.5                5.3 +/-    1.68       9.2 +/-    1.68  0.050 / 0.030
G28     86.1           43.9                5.4 +/-    0.88       7.3 +/-    0.88  0.220 / 0.220
G30     157.9          13.2                5.1 +/-    1.01      13.3 +/-    1.01  0.220 / 0.160