PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-14:28:10
G01     57.1           29.1                8.7 +/-    1.46      15.6 +/-    1.46  0.070 / 0.130
G06     179.7          17.5               13.2 +/-    3.46      31.0 +/-    3.46  0.090 / 0.120
G07     143.1          17.0               10.6 +/-    2.34      25.2 +/-    2.34  0.090 / 0.160
G11     46.4           19.0                7.2 +/-    2.81      16.2 +/-    2.81  0.090 / 0.150
G13     261.7          33.9                9.6 +/-    1.47      15.5 +/-    1.47  0.040 / 0.040
G15     293.7          15.8                5.8 +/-    0.68      14.1 +/-    0.68  0.040 / 0.030
G17     282.8          79.7               10.5 +/-    1.03      10.6 +/-    1.03  0.020 / 0.020
G19     236.6          55.4                9.6 +/-    1.98      11.4 +/-    1.98  0.020 / 0.020
G28     40.7           55.6                8.5 +/-    1.85      10.1 +/-    1.85  0.050 / 0.090
G30     145.3          51.5               10.4 +/-    0.76      12.8 +/-    0.76  0.060 / 0.090