PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/13-07:57:50
G02     45.6           44.2                2.8 +/-    2.20       3.8 +/-    2.20  0.030 / 0.030
G05     104.8          68.8                4.7 +/-    0.76       5.0 +/-    0.76  0.020 / 0.030
G12     192.2          55.2                4.3 +/-    0.39       5.2 +/-    0.39  0.100 / 0.120
G20     203.0          34.0                4.6 +/-    1.09       7.5 +/-    1.09  0.090 / 0.120
G25     275.6          57.9                8.8 +/-    2.83      10.2 +/-    2.83  0.030 / 0.030
G29     316.6          38.9                1.5 +/-    0.93       2.2 +/-    0.93  0.030 / 0.030