PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-14:57:50
G03     232.7          68.3                8.4 +/-    0.62       8.9 +/-    0.62  0.030 / 0.030
G09     302.9          17.1                6.1 +/-    1.52      14.4 +/-    1.52  0.030 / 0.030
G14     98.1           17.9                7.6 +/-    1.67      17.6 +/-    1.67  0.080 / 0.220
G16     125.3          58.9                9.0 +/-    0.53      10.4 +/-    0.53  0.080 / 0.230
G22     188.9          52.6                9.1 +/-    0.32      11.2 +/-    0.32  0.050 / 0.050
G23     322.6          52.5                7.4 +/-    0.51       9.0 +/-    0.51  0.040 / 0.050
G26     68.0           50.6                7.0 +/-    0.79       8.7 +/-    0.79  0.030 / 0.030
G31     52.5           18.3                5.3 +/-    3.17      12.1 +/-    3.17  0.030 / 0.030