PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-07:28:10
G03     251.9          68.4                4.2 +/-    0.57       4.5 +/-    0.57  0.040 / 0.040
G09     303.4          19.8                2.0 +/-    1.51       4.3 +/-    1.51  0.030 / 0.040
G14     99.0           14.1                3.1 +/-    2.13       7.8 +/-    2.13  0.100 / 0.140
G16     133.9          57.4                7.4 +/-    0.65       8.6 +/-    0.65  0.090 / 0.210
G22     196.0          57.8                6.1 +/-    1.10       7.1 +/-    1.10  0.140 / 0.290
G23     316.5          46.0                4.2 +/-    1.01       5.6 +/-    1.01  0.130 / 0.320
G26     75.3           54.1                6.2 +/-    0.54       7.4 +/-    0.54  0.030 / 0.040
G31     50.7           22.1                2.3 +/-    2.42       4.8 +/-    2.42  0.040 / 0.040