PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-12:12:40
G02     60.2           31.3                3.3 +/-    1.24       5.7 +/-    1.24  0.040 / 0.030
G05     59.3           61.8                4.0 +/-    0.24       4.5 +/-    0.24  0.030 / 0.030
G12     186.5          34.6                5.7 +/-    1.06       9.1 +/-    1.06  0.060 / 0.080
G13     129.9          14.7                5.1 +/-    4.25      12.8 +/-    4.25  0.080 / 0.080
G15     162.9          12.2                3.8 +/-    5.87      10.0 +/-    5.87  0.040 / 0.050
G20     209.1          56.2                7.0 +/-    0.56       8.2 +/-    0.56  0.040 / 0.050
G21     272.5          21.1                4.3 +/-    1.46       9.2 +/-    1.46  0.100 / 0.090
G25     237.8          52.3                6.8 +/-    3.03       8.3 +/-    3.03  0.080 / 0.050
G29     331.1          57.5                3.1 +/-    0.79       3.6 +/-    0.79  0.290 / 0.340