PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/15-08:27:50
G02     59.0           32.2                2.4 +/-    1.20       4.0 +/-    1.20  0.040 / 0.030
G05     60.8           61.9                4.1 +/-    0.35       4.6 +/-    0.35  0.030 / 0.040
G12     186.7          36.4                6.8 +/-    2.08      10.5 +/-    2.08  0.090 / 0.280
G13     130.9          13.5                4.4 +/-    2.70      11.3 +/-    2.70  0.090 / 0.280
G15     163.9          10.9               -0.6 +/-   19.11      -1.6 +/-   19.11  0.050 / 0.080
G20     209.3          51.7                7.2 +/-    1.48       8.9 +/-    1.48  0.050 / 0.070
G21     270.1          17.7                6.3 +/-    2.61      14.6 +/-    2.61  0.070 / 0.090
G25     241.9          53.5                4.1 +/-    1.31       4.9 +/-    1.31  0.060 / 0.110
G29     327.9          53.7                0.2 +/-    0.86       0.2 +/-    0.86  0.150 / 0.620