PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-12:12:40
G02     66.0           26.5                1.1 +/-    1.57       2.0 +/-    1.57  0.030 / 0.030
G05     51.1           55.2                2.4 +/-    0.59       2.9 +/-    0.59  0.020 / 0.030
G12     185.0          27.0                3.0 +/-    0.94       5.6 +/-    0.94  0.080 / 0.110
G13     124.1          19.6                5.9 +/-    2.86      13.2 +/-    2.86  0.080 / 0.110
G15     158.9          18.0                3.7 +/-    1.74       8.6 +/-    1.74  0.040 / 0.030
G20     214.0          64.0                3.9 +/-    0.89       4.3 +/-    0.89  0.030 / 0.030
G21     278.5          25.3                3.2 +/-    2.94       6.3 +/-    2.94  0.080 / 0.130
G25     228.3          46.8                3.8 +/-    3.06       5.0 +/-    3.06  0.080 / 0.110
G29     336.7          64.4                1.1 +/-    0.47       1.2 +/-    0.47  0.110 / 0.250