PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-08:13:10
G02     61.2           30.3                3.5 +/-    1.09       6.1 +/-    1.09  0.020 / 0.030
G05     56.7           59.5                4.0 +/-    0.51       4.5 +/-    0.51  0.020 / 0.040
G12     186.0          33.3                5.8 +/-    1.52       9.5 +/-    1.52  0.070 / 0.180
G13     128.6          15.4                5.3 +/-    2.51      13.1 +/-    2.51  0.110 / 0.170
G15     162.3          13.1                5.7 +/-    4.09      14.9 +/-    4.09  0.050 / 0.050
G20     211.0          54.6                6.6 +/-    0.80       7.9 +/-    0.80  0.040 / 0.050
G21     272.3          19.3                4.2 +/-    2.11       9.4 +/-    2.11  0.040 / 0.090
G25     237.5          51.7                6.5 +/-    2.44       8.0 +/-    2.44  0.070 / 0.080
G29     329.7          56.3                3.4 +/-    0.53       4.0 +/-    0.53  0.030 / 0.080