PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/18-13:12:40
G08     280.6          23.0                2.9 +/-    1.09       5.9 +/-    1.09  0.090 / 0.160
G10     32.7           62.0                2.7 +/-    1.50       3.0 +/-    1.50  0.120 / 0.140
G14     241.2          56.6                4.9 +/-    2.82       5.7 +/-    2.82  0.020 / 0.020
G18     316.6          22.3                2.3 +/-    1.78       4.9 +/-    1.78  0.030 / 0.020
G20     79.5           45.9                3.0 +/-    0.75       4.0 +/-    0.75  0.060 / 0.070
G21     150.1          25.3                3.1 +/-    2.08       6.1 +/-    2.08  0.060 / 0.080
G24     46.1           17.9                3.1 +/-    2.05       7.1 +/-    2.05  0.030 / 0.020
G27     246.4          26.1                3.5 +/-    1.69       6.7 +/-    1.69  0.050 / 0.020
G31     183.5          13.2               -0.0 +/-    4.93      -0.1 +/-    4.93  0.140 / 0.180
G32     267.9          72.1                3.3 +/-    0.70       3.5 +/-    0.70  0.130 / 0.130