PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/17-12:28:00
G10     295.8          51.0                4.8 +/-    3.10       5.9 +/-    3.10  0.090 / 0.090
G15     46.0           27.4                3.4 +/-    2.15       6.3 +/-    2.15  0.060 / 0.090
G20     68.8           23.5                4.0 +/-    1.43       8.2 +/-    1.43  0.080 / 0.110
G21     98.4           72.5                5.9 +/-    1.35       6.1 +/-    1.35  0.080 / 0.140
G24     99.1           26.3                4.4 +/-    1.28       8.3 +/-    1.28  0.040 / 0.030
G27     300.2          34.5                4.8 +/-    1.83       7.7 +/-    1.83  0.040 / 0.040
G32     210.3          32.0                4.1 +/-    2.15       6.9 +/-    2.15  0.060 / 0.080