PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/07-13:27:50
G02     63.4           28.7                1.6 +/-    0.94       3.0 +/-    0.94  0.030 / 0.030
G05     54.3           58.7                2.9 +/-    0.67       3.3 +/-    0.67  0.030 / 0.030
G12     185.6          30.1                5.3 +/-    1.47       9.2 +/-    1.47  0.090 / 0.080
G13     126.7          17.5                6.8 +/-    2.15      15.9 +/-    2.15  0.060 / 0.130
G15     160.7          15.4                4.5 +/-    1.76      11.0 +/-    1.76  0.040 / 0.030
G20     211.3          61.6                6.5 +/-    0.71       7.2 +/-    0.71  0.040 / 0.030
G21     276.0          23.8                3.8 +/-    0.71       7.7 +/-    0.71  0.060 / 0.100
G25     231.3          49.1                5.8 +/-    2.19       7.4 +/-    2.19  0.050 / 0.090
G29     335.3          62.3                2.1 +/-    0.52       2.3 +/-    0.52  0.190 / 0.230