PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-17:28:10
G01     125.1          13.3               12.7 +/-    1.86      32.9 +/-    1.86  0.050 / 0.050
G07     59.1           69.4                9.8 +/-    0.36      10.4 +/-    0.36  0.040 / 0.070
G08     49.8           39.6                8.0 +/-    1.32      11.7 +/-    1.32  0.030 / 0.030
G09     177.9          33.5               12.9 +/-    0.86      21.0 +/-    0.86  0.030 / 0.030
G11     116.7          36.5               10.7 +/-    0.97      16.5 +/-    0.97  0.090 / 0.200
G13     320.5          13.5                9.3 +/-    5.83      24.0 +/-    5.83  0.100 / 0.180
G17     201.3          14.7               13.9 +/-    2.05      34.9 +/-    2.05  0.040 / 0.020
G18     101.8          17.8               10.3 +/-    1.30      23.9 +/-    1.30  0.030 / 0.030
G28     280.5          54.3               10.3 +/-    2.88      12.3 +/-    2.88  0.080 / 0.060
G30     337.2          63.2                9.5 +/-    0.47      10.5 +/-    0.47  0.120 / 0.090