PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/11-12:57:50
G02     58.7           32.7                1.8 +/-    1.16       3.0 +/-    1.16  0.040 / 0.020
G05     62.7           63.7                2.4 +/-    0.31       2.7 +/-    0.31  0.050 / 0.020
G12     186.9          36.5                4.1 +/-    0.80       6.4 +/-    0.80  0.050 / 0.070
G13     131.3          13.4                5.2 +/-    2.97      13.3 +/-    2.97  0.060 / 0.090
G15     164.0          10.8               -4.0 +/-   15.87     -10.9 +/-   15.87  0.030 / 0.050
G20     207.8          54.8                4.6 +/-    0.57       5.5 +/-    0.57  0.040 / 0.050
G21     271.1          20.3                5.2 +/-    4.01      11.3 +/-    4.01  0.100 / 0.040
G25     240.2          53.4                4.1 +/-    4.53       4.9 +/-    4.53  0.110 / 0.080
G29     330.3          56.3                1.4 +/-    0.78       1.6 +/-    0.78  0.190 / 0.320