PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/28-06:58:00
G02     46.1           43.8                4.1 +/-    1.20       5.6 +/-    1.20  0.050 / 0.040
G05     102.1          68.8                5.6 +/-    0.55       5.9 +/-    0.55  0.040 / 0.040
G12     191.7          54.4                7.9 +/-    1.70       9.4 +/-    1.70  0.070 / 0.110
G20     203.4          33.9                7.3 +/-    1.51      11.9 +/-    1.51  0.080 / 0.140
G25     274.5          57.9                6.5 +/-    0.67       7.6 +/-    0.67  0.050 / 0.050
G29     316.7          38.9                4.1 +/-    0.72       6.1 +/-    0.72  0.070 / 0.070