PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-20:57:40
G02     30.2           58.0               11.4 +/-    0.68      13.2 +/-    0.68  0.040 / 0.040
G05     145.8          61.3               13.5 +/-    0.53      15.1 +/-    0.53  0.040 / 0.050
G06     54.6           15.0                8.1 +/-    3.57      20.1 +/-    3.57  0.040 / 0.040
G12     196.3          66.0               11.2 +/-    0.35      12.2 +/-    0.35  0.030 / 0.040
G20     197.8          28.3               16.9 +/-    1.48      30.6 +/-    1.48  0.030 / 0.030
G25     289.7          58.1                7.8 +/-    1.71       9.0 +/-    1.71  0.050 / 0.030
G29     308.7          30.0               11.0 +/-    1.47      19.3 +/-    1.47  0.060 / 0.130