PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/20-08:12:30
G01     60.3           29.9                4.2 +/-    1.86       7.4 +/-    1.86  0.040 / 0.030
G06     179.3          13.7               -2.4 +/-   25.59      -6.1 +/-   25.59  0.040 / 0.030
G07     141.0          23.2                5.2 +/-    2.19      10.6 +/-    2.19  0.150 / 0.260
G11     49.7           27.8                2.7 +/-    1.46       5.0 +/-    1.46  0.130 / 0.300
G13     263.2          36.9                6.2 +/-    1.46       9.5 +/-    1.46  0.280 / 0.410
G15     294.5          16.6                3.1 +/-    1.50       7.4 +/-    1.50  0.210 / 0.340
G17     248.9          74.7                6.9 +/-    0.39       7.2 +/-    0.39  0.080 / 0.140
G19     229.9          51.4                7.2 +/-    3.23       9.0 +/-    3.23  0.090 / 0.160
G28     18.1           60.4                1.8 +/-    1.69       2.1 +/-    1.69  0.040 / 0.050
G30     143.2          57.2                7.1 +/-    0.38       8.2 +/-    0.38  0.040 / 0.050