PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/19-13:57:30
G02     47.9           42.4                4.8 +/-    1.28       6.8 +/-    1.28  0.030 / 0.020
G05     100.6          70.1                7.1 +/-    0.54       7.5 +/-    0.54  0.030 / 0.020
G12     190.7          51.0                8.4 +/-    0.53      10.4 +/-    0.53  0.170 / 0.320
G20     202.3          41.2                8.1 +/-    0.82      11.6 +/-    0.82  0.140 / 0.290
G21     260.2          11.0               -4.7 +/-    7.88     -12.9 +/-    7.88  0.060 / 0.080
G25     264.9          58.7                4.3 +/-    1.56       4.9 +/-    1.56  0.070 / 0.060
G29     321.5          45.4                4.7 +/-    0.64       6.3 +/-    0.64  0.040 / 0.040