PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-07:43:00
G03     234.7          65.7                5.8 +/-    0.62       6.2 +/-    0.62  0.040 / 0.050
G07     251.2          12.1                4.1 +/-    6.70      11.0 +/-    6.70  0.050 / 0.050
G09     307.0          24.5                3.6 +/-    1.77       7.1 +/-    1.77  0.160 / 0.300
G14     103.8          10.1                3.9 +/-    2.23      10.8 +/-    2.23  0.120 / 0.250
G16     122.2          62.1                6.7 +/-    0.57       7.5 +/-    0.57  0.110 / 0.120
G22     191.9          51.2                6.8 +/-    0.64       8.4 +/-    0.64  0.160 / 0.110
G23     321.3          51.0                4.6 +/-    0.60       5.7 +/-    0.60  0.210 / 0.420
G26     65.3           51.3                5.6 +/-    1.23       6.9 +/-    1.23  0.160 / 0.330
G31     54.0           17.4                1.9 +/-    3.07       4.6 +/-    3.07  0.040 / 0.030