PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/12-12:43:00
G02     54.9           36.0                5.0 +/-    1.41       7.8 +/-    1.41  0.030 / 0.020
G05     72.8           66.9                6.1 +/-    0.37       6.6 +/-    0.37  0.030 / 0.020
G12     188.1          41.7                7.7 +/-    1.31      10.8 +/-    1.31  0.040 / 0.050
G13     134.9          10.2               -1.9 +/-   18.79      -5.3 +/-   18.79  0.040 / 0.050
G20     205.6          49.5                8.0 +/-    1.09      10.1 +/-    1.09  0.040 / 0.050
G21     267.2          17.4                7.3 +/-    2.40      17.2 +/-    2.40  0.050 / 0.070
G25     248.6          56.1                6.5 +/-    1.93       7.7 +/-    1.93  0.170 / 0.330
G29     326.7          51.8                4.0 +/-    1.28       5.0 +/-    1.28  0.220 / 0.350