PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/23-10:12:40
G10     243.3          19.7                3.5 +/-    3.09       7.7 +/-    3.09  0.110 / 0.410
G13     63.6           34.7                6.0 +/-    0.82       9.6 +/-    0.82  0.130 / 0.320
G15     102.4          56.6                7.1 +/-    0.73       8.3 +/-    0.73  0.050 / 0.050
G16     305.8          14.3                1.7 +/-    3.31       4.4 +/-    3.31  0.040 / 0.050
G20     29.3           62.3                5.5 +/-    0.53       6.2 +/-    0.53  0.030 / 0.040
G21     325.5          55.5                4.6 +/-    0.35       5.4 +/-    0.35  0.040 / 0.040
G26     276.7          18.6                2.9 +/-    0.96       6.7 +/-    0.96  0.070 / 0.090
G29     161.0          58.8                8.6 +/-    0.55       9.9 +/-    0.55  0.060 / 0.110