PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-21:43:10
G02     29.9           58.2               13.6 +/-    0.52      15.8 +/-    0.52  0.030 / 0.060
G05     143.7          61.9               17.1 +/-    0.65      19.1 +/-    0.65  0.040 / 0.050
G06     54.9           14.5                9.7 +/-    2.72      24.5 +/-    2.72  0.060 / 0.110
G12     195.0          65.2               15.6 +/-    1.14      17.0 +/-    1.14  0.080 / 0.110
G20     197.7          28.9               22.7 +/-    1.48      40.7 +/-    1.48  0.030 / 0.050
G25     289.7          57.8               15.2 +/-    0.80      17.6 +/-    0.80  0.040 / 0.050
G29     308.8          30.0               14.8 +/-    1.51      25.9 +/-    1.51  0.040 / 0.050