PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/26-11:57:40
G02     59.3           32.1                3.7 +/-    1.10       6.3 +/-    1.10  0.030 / 0.030
G05     61.1           62.7                3.3 +/-    0.39       3.7 +/-    0.39  0.030 / 0.020
G12     186.8          35.9                5.6 +/-    1.39       8.8 +/-    1.39  0.040 / 0.050
G13     130.8          13.8                6.2 +/-    2.83      15.8 +/-    2.83  0.030 / 0.050
G15     163.6          11.3               -0.8 +/-   13.78      -2.1 +/-   13.78  0.060 / 0.060
G20     208.5          54.8                7.2 +/-    0.81       8.7 +/-    0.81  0.060 / 0.070
G21     271.4          20.3                4.1 +/-    2.45       9.1 +/-    2.45  0.190 / 0.270
G25     239.7          53.1                7.0 +/-    4.30       8.5 +/-    4.30  0.250 / 0.280
G29     330.1          56.2                3.5 +/-    0.96       4.1 +/-    0.96  0.040 / 0.080