PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-09:12:50
G01     122.4          15.4                5.6 +/-    1.72      13.7 +/-    1.72  0.030 / 0.040
G07     71.9           67.7                5.5 +/-    0.62       5.9 +/-    0.62  0.030 / 0.040
G08     46.0           33.0                3.8 +/-    0.77       6.3 +/-    0.77  0.020 / 0.060
G09     174.0          25.5                5.0 +/-    1.62       9.7 +/-    1.62  0.030 / 0.040
G11     110.0          38.5                5.8 +/-    1.00       8.6 +/-    1.00  0.130 / 0.210
G13     319.2          16.7                0.9 +/-    1.78       2.2 +/-    1.78  0.130 / 0.230
G17     200.2          22.2                3.9 +/-    2.55       8.0 +/-    2.55  0.090 / 0.240
G18     96.7           19.2                5.1 +/-    1.06      11.3 +/-    1.06  0.100 / 0.180
G28     284.5          55.1                4.1 +/-    1.35       4.9 +/-    1.35  0.110 / 0.320
G30     337.7          64.2                2.9 +/-    0.68       3.1 +/-    0.68  0.100 / 0.300