PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-22:57:50
G02     57.8310        35.7561          9.1703 +/-  0.6629   14.3522 +/-  0.6629  0.050 / 0.070
G05     60.2973        63.6441          9.2121 +/-  0.5756   10.1551 +/-  0.5756  0.060 / 0.080
G12     183.9332       30.5938         12.2567 +/-  1.1847   21.2019 +/-  1.1847  0.120 / 0.100
G13     129.2150       15.4970         13.3188 +/-  3.6089   32.7305 +/-  3.6089  0.110 / 0.100
G15     165.7393       10.8419          1.1232 +/- 28.7500    3.0771 +/- 28.7500  0.050 / 0.130
G20     206.7107       62.3512         11.3470 +/-  0.6395   12.6351 +/-  0.6395  0.060 / 0.080
G21     271.1705       17.4008         12.3319 +/-  1.0789   28.9223 +/-  1.0789  0.030 / 0.030
G25     228.8143       50.4036         11.3727 +/-  2.6318   14.2721 +/-  2.6318  0.040 / 0.030
G29     329.5682       56.4715         10.8841 +/-  0.4059   12.7752 +/-  0.4059  0.030 / 0.030