PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/19-13:42:50
G02     209.1          42.8                6.8 +/-    1.66       9.4 +/-    1.66  0.130 / 0.090
G06     115.5          78.8                6.0 +/-    0.69       6.1 +/-    0.69  0.100 / 0.090
G12     314.4          27.7                3.8 +/-    0.52       7.0 +/-    0.52  0.050 / 0.130
G17     47.6           39.4                4.2 +/-    0.98       6.2 +/-    0.98  0.060 / 0.120
G19     14.2           60.6                4.7 +/-    0.43       5.3 +/-    0.43  0.040 / 0.020
G24     280.0          43.3                2.6 +/-    1.27       3.6 +/-    1.27  0.040 / 0.030
G28     112.7          23.9                5.8 +/-    0.83      11.6 +/-    0.83  0.040 / 0.040