PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-19:27:50
G01     252.8          36.0               11.4 +/-    2.32      17.7 +/-    2.32  0.040 / 0.030
G03     316.1          44.0                8.7 +/-    0.83      11.9 +/-    0.83  0.030 / 0.040
G11     240.1          13.6                9.5 +/-    0.97      24.4 +/-    0.97  0.350 / 0.210
G14     58.3           42.2                9.3 +/-    1.51      13.0 +/-    1.51  0.110 / 0.270
G22     306.2          65.2                9.4 +/-    0.49      10.3 +/-    0.49  0.090 / 0.080
G23     285.7          18.8               10.8 +/-    1.11      24.5 +/-    1.11  0.070 / 0.070
G25     41.1           11.2                9.2 +/-    2.89      25.0 +/-    2.89  0.030 / 0.030
G26     138.0          36.7               14.0 +/-    0.88      21.6 +/-    0.88  0.040 / 0.030
G31     41.1           60.3                9.5 +/-    0.42      10.7 +/-    0.42  0.060 / 0.090
G32     76.3           23.6               10.9 +/-    1.84      21.9 +/-    1.84  0.040 / 0.080