PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-20:12:20
G02     44.8           46.0               12.2 +/-    0.43      16.1 +/-    0.43  0.040 / 0.050
G05     113.8          71.0               13.8 +/-    0.58      14.5 +/-    0.58  0.040 / 0.060
G12     188.8          50.1               13.3 +/-    0.53      16.7 +/-    0.53  0.030 / 0.040
G20     200.7          43.1               13.9 +/-    0.74      19.2 +/-    0.74  0.030 / 0.040
G25     259.1          59.9               10.3 +/-    1.33      11.7 +/-    1.33  0.030 / 0.020
G29     319.1          42.3               12.3 +/-    1.13      17.3 +/-    1.13  0.030 / 0.020