PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-23:27:40
G02     68.8260        27.0774          7.1526 +/-  0.6719   13.3367 +/-  0.6719  0.080 / 0.100
G05     47.4221        51.4045          8.7666 +/-  0.9349   10.8710 +/-  0.9349  0.060 / 0.100
G12     181.3210       17.2867         13.7806 +/-  4.2839   32.4109 +/-  4.2839  0.200 / 0.270
G13     118.1099       24.4305         12.3543 +/-  1.8701   24.4583 +/-  1.8701  0.130 / 0.270
G15     158.6178       21.6750         12.3000 +/-  0.9894   25.9876 +/-  0.9894  0.080 / 0.090
G18     222.4948       11.2789          0.4853 +/- 24.9621    1.3170 +/- 24.9621  0.080 / 0.090
G20     218.9917       77.1662         10.0951 +/-  0.4231   10.3266 +/-  0.4231  0.030 / 0.030
G21     281.9983       25.4232         10.4530 +/-  1.9065   20.2278 +/-  1.9065  0.030 / 0.030
G25     215.5934       38.6868         12.8623 +/-  1.4821   19.1208 +/-  1.4821  0.030 / 0.060
G29     339.4943       69.8439          9.6136 +/-  1.0380   10.1716 +/-  1.0380  0.030 / 0.040