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                4.6 +/-    1.88      11.1 +/-    1.88  0.030 / 0.030
G07     75.1           67.2                6.7 +/-    0.33       7.2 +/-    0.33  0.030 / 0.040
G08     45.4           32.0                4.0 +/-    1.21       6.7 +/-    1.21  0.230 / 0.320
G09     174.0          24.4                7.7 +/-    1.17      15.3 +/-    1.17  0.170 / 0.250
G11     108.5          39.0                7.3 +/-    1.01      10.8 +/-    1.01  0.030 / 0.030
G13     318.7          17.7                1.9 +/-    2.24       4.4 +/-    2.24  0.030 / 0.030
G17     200.4          23.3                4.9 +/-    3.95       9.9 +/-    3.95  0.150 / 0.180
G18     95.5           19.7                4.9 +/-    1.19      10.8 +/-    1.19  0.130 / 0.220
G28     286.6          55.7                4.7 +/-    2.41       5.6 +/-    2.41  0.100 / 0.220
G30     339.4          65.3                5.7 +/-    0.64       6.2 +/-    0.64  0.080 / 0.190