PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-07:28:00
G08     299.3          21.3                4.2 +/-    1.43       8.9 +/-    1.43  0.050 / 0.080
G10     359.4          62.8                3.8 +/-    0.33       4.3 +/-    0.33  0.040 / 0.070
G14     226.8          38.5                7.1 +/-    1.10      10.6 +/-    1.10  0.080 / 0.140
G20     76.8           38.3                4.0 +/-    0.45       5.9 +/-    0.45  0.070 / 0.170
G21     144.7          44.3                7.5 +/-    1.10      10.2 +/-    1.10  0.060 / 0.120
G24     59.1           26.8                3.1 +/-    1.20       5.8 +/-    1.20  0.060 / 0.110
G27     257.8          33.2                6.2 +/-    1.88      10.1 +/-    1.88  0.030 / 0.030
G32     240.8          66.8                7.4 +/-    0.60       8.0 +/-    0.60  0.030 / 0.030