PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/20-11:12:50
G10     294.4          51.2                3.0 +/-    2.26       3.8 +/-    2.26  0.030 / 0.030
G15     46.5           29.8                1.9 +/-    1.15       3.4 +/-    1.15  0.040 / 0.030
G20     347.0          65.4                3.4 +/-    0.73       3.7 +/-    0.73  0.120 / 0.050
G21     97.3           71.3                4.5 +/-    0.53       4.7 +/-    0.53  0.090 / 0.050
G24     97.7           25.3                7.2 +/-    0.94      14.0 +/-    0.94  0.060 / 0.110
G27     305.2          31.5                4.1 +/-    1.06       7.0 +/-    1.06  0.060 / 0.110
G32     210.1          26.3                3.0 +/-    1.28       5.7 +/-    1.28  0.090 / 0.160