PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-09:27:50
G02     231.9          74.0                7.0 +/-    0.55       7.2 +/-    0.55  0.290 / 0.340
G05     173.6          12.4                4.0 +/-    6.19      10.7 +/-    6.19  0.230 / 0.340
G06     41.9           68.9                4.5 +/-    0.39       4.8 +/-    0.39  0.060 / 0.090
G12     321.0          46.1                5.3 +/-    0.63       7.1 +/-    0.63  0.050 / 0.080
G17     68.3           24.1                3.8 +/-    1.61       7.6 +/-    1.61  0.030 / 0.040
G19     54.2           40.2                3.4 +/-    1.14       4.9 +/-    1.14  0.040 / 0.050
G24     251.5          37.1                6.0 +/-    1.18       9.2 +/-    1.18  0.030 / 0.020