PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-08:57:40
G01     319.8          15.7                3.3 +/-    2.15       8.1 +/-    2.15  0.100 / 0.290
G08     262.4          14.4                7.3 +/-    1.11      18.4 +/-    1.11  0.110 / 0.240
G10     75.5           54.7                6.5 +/-    0.54       7.8 +/-    0.54  0.150 / 0.290
G11     306.2          21.0                4.8 +/-    2.02      10.4 +/-    2.02  0.190 / 0.330
G18     307.4          37.6                4.2 +/-    1.20       6.4 +/-    1.20  0.150 / 0.300
G20     108.8          13.2                5.5 +/-    2.71      14.2 +/-    2.71  0.160 / 0.340
G22     300.4          12.3                2.8 +/-    6.19       7.4 +/-    6.19  0.160 / 0.220
G31     174.7          41.1                8.5 +/-    1.01      12.2 +/-    1.01  0.190 / 0.220
G32     6.7            68.2                5.7 +/-    0.32       6.0 +/-    0.32  0.070 / 0.090