PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-12:12:40
G01     230.8          21.1                5.1 +/-    1.76      10.9 +/-    1.76  0.090 / 0.150
G03     297.5          65.1                4.2 +/-    0.75       4.5 +/-    0.75  0.220 / 0.260
G14     79.0           31.9                2.0 +/-    1.33       3.3 +/-    1.33  0.060 / 0.130
G16     149.2          40.4                8.0 +/-    1.73      11.5 +/-    1.73  0.050 / 0.150
G18     207.4          11.3                2.9 +/-    2.08       7.9 +/-    2.08  0.040 / 0.030
G22     217.7          73.7                6.4 +/-    0.32       6.6 +/-    0.32  0.030 / 0.030
G23     305.5          37.1                5.1 +/-    1.15       7.7 +/-    1.15  0.030 / 0.060
G26     104.3          52.4                6.7 +/-    1.02       8.2 +/-    1.02  0.030 / 0.040
G31     43.9           35.1                4.6 +/-    1.18       7.2 +/-    1.18  0.070 / 0.100