PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/19-13:57:50
G02     47.9           42.4                4.7 +/-    0.46       6.6 +/-    0.46  0.030 / 0.030
G05     100.6          70.1                6.0 +/-    0.60       6.3 +/-    0.60  0.030 / 0.030
G12     190.7          51.0                7.5 +/-    2.15       9.4 +/-    2.15  0.040 / 0.060
G20     202.3          41.2                7.8 +/-    0.88      11.2 +/-    0.88  0.030 / 0.050
G21     260.2          11.0               -0.5 +/-   13.33      -1.5 +/-   13.33  0.070 / 0.090
G25     264.9          58.7                5.8 +/-    0.91       6.7 +/-    0.91  0.060 / 0.080
G29     321.5          45.4                2.9 +/-    1.75       3.9 +/-    1.75  0.140 / 0.550