PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-11:58:00
G02     47.8           42.3                4.1 +/-    1.16       5.8 +/-    1.16  0.020 / 0.020
G05     99.3           69.6                7.5 +/-    0.67       8.0 +/-    0.67  0.030 / 0.020
G06     61.2           9.9                 4.6 +/-    2.17      12.8 +/-    2.17  0.100 / 0.080
G12     191.1          51.9               10.5 +/-    0.55      13.0 +/-    0.55  0.070 / 0.090
G20     202.6          39.5                8.8 +/-    1.07      13.0 +/-    1.07  0.030 / 0.030
G21     260.1          11.6               -1.1 +/-   10.30      -2.9 +/-   10.30  0.040 / 0.040
G25     267.6          58.4                9.4 +/-    1.65      10.9 +/-    1.65  0.040 / 0.040
G29     320.1          43.5                4.5 +/-    0.61       6.3 +/-    0.61  0.040 / 0.030