PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-13:27:50
G01     248.7          34.1                8.1 +/-    1.40      13.2 +/-    1.40  0.180 / 0.560
G03     315.2          48.8                5.0 +/-    0.80       6.3 +/-    0.80  0.270 / 0.370
G11     237.1          11.3                5.5 +/-    2.53      15.0 +/-    2.53  0.040 / 0.060
G14     59.8           42.5                5.7 +/-    0.79       8.0 +/-    0.79  0.050 / 0.070
G18     220.1          26.1                6.3 +/-    3.07      12.1 +/-    3.07  0.070 / 0.180
G22     295.3          73.3                5.4 +/-    0.52       5.6 +/-    0.52  0.070 / 0.110
G23     290.3          24.5               -0.7 +/-    1.73      -1.4 +/-    1.73  0.110 / 0.090
G26     131.8          40.5                8.1 +/-    0.65      11.7 +/-    0.65  0.040 / 0.060
G31     40.9           54.0                5.7 +/-    0.47       6.8 +/-    0.47  0.050 / 0.040
G32     80.0           20.1                5.8 +/-    1.48      12.7 +/-    1.48  0.040 / 0.030