PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/17-08:42:40
G02     67.1           25.5                5.1 +/-    2.05       9.9 +/-    2.05  0.040 / 0.050
G05     49.7           52.8                4.3 +/-    0.69       5.2 +/-    0.69  0.050 / 0.050
G12     184.5          25.7                7.2 +/-    3.06      13.8 +/-    3.06  0.090 / 0.250
G13     122.7          20.4                7.4 +/-    1.88      16.1 +/-    1.88  0.120 / 0.180
G15     158.2          19.1                9.4 +/-    2.41      21.2 +/-    2.41  0.030 / 0.040
G20     216.2          62.7                9.2 +/-    1.71      10.2 +/-    1.71  0.030 / 0.040
G21     278.5          23.9                4.4 +/-    1.32       8.9 +/-    1.32  0.050 / 0.120
G25     227.9          46.0                6.3 +/-    1.84       8.3 +/-    1.84  0.040 / 0.130
G29     335.1          63.7                4.6 +/-    0.73       5.1 +/-    0.73  0.050 / 0.070