PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-08:27:50
G08     271.5          18.4                6.9 +/-    1.29      15.7 +/-    1.29  0.050 / 0.060
G10     58.0           59.1                4.8 +/-    0.53       5.5 +/-    0.53  0.050 / 0.060
G14     258.2          60.8                5.5 +/-    1.54       6.2 +/-    1.54  0.090 / 0.230
G18     313.5          29.6                4.0 +/-    1.45       7.1 +/-    1.45  0.210 / 0.160
G20     101.1          20.8                4.8 +/-    1.61      10.3 +/-    1.61  0.270 / 0.270
G21     154.5          17.2                4.0 +/-    1.75       9.3 +/-    1.75  0.080 / 0.390
G24     40.2           10.9                3.3 +/-    1.98       9.0 +/-    1.98  0.090 / 0.160
G27     232.7          16.8                5.9 +/-    1.86      14.1 +/-    1.86  0.140 / 0.180
G31     177.0          30.6                5.1 +/-    1.76       8.8 +/-    1.76  0.030 / 0.030
G32     340.5          74.5                5.7 +/-    0.36       5.9 +/-    0.36  0.030 / 0.030