PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/11-13:12:40
G02     64.0           28.3                1.4 +/-    0.79       2.6 +/-    0.79  0.030 / 0.040
G05     53.6           58.0                2.5 +/-    0.75       2.8 +/-    0.75  0.030 / 0.050
G12     185.5          29.5                4.3 +/-    2.01       7.7 +/-    2.01  0.080 / 0.190
G13     126.2          17.9                5.4 +/-    1.62      12.4 +/-    1.62  0.090 / 0.180
G15     160.3          15.9                6.3 +/-    2.14      15.3 +/-    2.14  0.050 / 0.050
G20     211.8          62.1                5.7 +/-    0.49       6.3 +/-    0.49  0.040 / 0.050
G21     276.6          24.4                5.5 +/-    1.66      10.9 +/-    1.66  0.050 / 0.090
G25     230.7          48.7                5.8 +/-    1.23       7.5 +/-    1.23  0.070 / 0.110
G29     335.5          62.7                0.8 +/-    0.76       0.9 +/-    0.76  0.070 / 0.350