PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-10:12:40
G05     51.7           10.3                2.2 +/-    0.98       6.1 +/-    0.98  0.040 / 0.060
G10     240.7          17.0                4.9 +/-    1.42      11.6 +/-    1.42  0.040 / 0.060
G13     68.0           35.8                3.5 +/-    0.74       5.4 +/-    0.74  0.130 / 0.330
G15     109.6          55.6                5.3 +/-    0.31       6.2 +/-    0.31  0.110 / 0.300
G16     309.2          13.6                2.9 +/-    1.23       7.4 +/-    1.23  0.130 / 0.260
G20     25.5           65.6                3.1 +/-    0.61       3.4 +/-    0.61  0.080 / 0.240
G21     321.6          53.1                3.6 +/-    1.49       4.3 +/-    1.49  0.050 / 0.090
G26     280.4          19.5                4.6 +/-    0.91      10.3 +/-    0.91  0.060 / 0.120
G29     159.2          63.0                5.9 +/-    1.10       6.5 +/-    1.10  0.090 / 0.260