PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-08:12:50
G08     278.3          20.4                5.3 +/-    2.42      11.5 +/-    2.42  0.140 / 0.190
G10     44.4           61.3                3.5 +/-    0.31       3.9 +/-    0.31  0.140 / 0.250
G14     247.6          55.9                7.3 +/-    0.70       8.6 +/-    0.70  0.040 / 0.080
G18     316.0          23.8                2.5 +/-    2.16       4.9 +/-    2.16  0.040 / 0.080
G20     95.6           25.3                5.6 +/-    1.51      11.0 +/-    1.51  0.080 / 0.160
G21     153.0          23.8                4.5 +/-    2.71       9.0 +/-    2.71  0.070 / 0.140
G24     43.5           15.7                2.5 +/-    0.90       6.0 +/-    0.90  0.030 / 0.030
G27     238.0          21.3                7.2 +/-    2.51      15.3 +/-    2.51  0.030 / 0.030
G31     178.5          23.7                4.2 +/-    1.22       8.4 +/-    1.22  0.110 / 0.330
G32     312.2          76.8                5.1 +/-    0.76       5.2 +/-    0.76  0.130 / 0.320