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                2.7 +/-    4.48       7.4 +/-    4.48  0.170 / 0.240
G10     240.7          17.0                4.3 +/-    2.36      10.1 +/-    2.36  0.200 / 0.460
G13     68.0           35.8                2.9 +/-    1.05       4.5 +/-    1.05  0.140 / 0.270
G15     109.6          55.6                4.7 +/-    1.03       5.6 +/-    1.03  0.090 / 0.290
G16     309.2          13.6                2.4 +/-    2.43       6.2 +/-    2.43  0.040 / 0.060
G20     25.5           65.6                1.6 +/-    0.80       1.8 +/-    0.80  0.030 / 0.070
G21     321.6          53.1                2.2 +/-    1.02       2.7 +/-    1.02  0.040 / 0.030
G26     280.4          19.5                5.3 +/-    1.19      11.7 +/-    1.19  0.030 / 0.040
G29     159.2          63.0                4.8 +/-    0.68       5.3 +/-    0.68  0.050 / 0.110