PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-04:43:10
G01     228.7          19.4                5.1 +/-    2.30      11.4 +/-    2.30  0.050 / 0.120
G03     297.4          63.3                5.8 +/-    1.08       6.4 +/-    1.08  0.050 / 0.120
G14     84.4           24.9                4.3 +/-    1.17       8.4 +/-    1.17  0.040 / 0.030
G16     153.4          40.1                7.4 +/-    0.95      10.8 +/-    0.95  0.030 / 0.030
G22     228.5          73.5                6.2 +/-    0.53       6.5 +/-    0.53  0.120 / 0.350
G23     303.8          33.4                1.8 +/-    0.89       2.9 +/-    0.89  0.240 / 0.310
G26     110.2          53.9                6.5 +/-    0.46       7.9 +/-    0.46  0.110 / 0.150
G31     43.0           37.8                3.6 +/-    1.41       5.5 +/-    1.41  0.110 / 0.140
G32     95.8           10.6                4.1 +/-    1.82      11.3 +/-    1.82  0.060 / 0.090