PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/17-09:27:50
G01     121.4          16.1                4.4 +/-    1.64      10.5 +/-    1.64  0.030 / 0.040
G07     75.1           67.2                5.5 +/-    0.63       5.9 +/-    0.63  0.030 / 0.040
G08     45.4           32.0                3.5 +/-    0.87       5.9 +/-    0.87  0.020 / 0.040
G09     174.0          24.4                6.6 +/-    1.10      13.1 +/-    1.10  0.030 / 0.040
G11     108.5          39.0                6.2 +/-    0.77       9.2 +/-    0.77  0.110 / 0.230
G13     318.7          17.7                1.0 +/-    1.60       2.3 +/-    1.60  0.130 / 0.220
G17     200.4          23.3                4.0 +/-    1.44       8.2 +/-    1.44  0.090 / 0.210
G18     95.5           19.7                5.3 +/-    0.67      11.7 +/-    0.67  0.090 / 0.200
G28     286.6          55.7                4.4 +/-    0.69       5.2 +/-    0.69  0.080 / 0.160
G30     339.4          65.3                3.6 +/-    0.53       4.0 +/-    0.53  0.090 / 0.190