PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-21:27:40
G02     21.6           63.8               13.1 +/-    0.87      14.5 +/-    0.87  0.050 / 0.050
G05     152.9          55.1               16.7 +/-    0.41      19.9 +/-    0.41  0.040 / 0.040
G06     51.1           19.9                9.9 +/-    2.59      21.9 +/-    2.59  0.030 / 0.030
G12     205.0          72.9               16.4 +/-    0.47      17.1 +/-    0.47  0.040 / 0.030
G19     96.4           11.6               13.1 +/-    3.07      35.3 +/-    3.07  0.050 / 0.060
G20     197.1          21.8               22.4 +/-    1.98      47.1 +/-    1.98  0.040 / 0.060
G25     301.0          53.5               14.1 +/-    1.04      17.1 +/-    1.04  0.030 / 0.050
G29     303.8          24.8               13.4 +/-    1.17      26.4 +/-    1.17  0.030 / 0.040