PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/16-08:13:10
G02     55.5           35.2                1.8 +/-    0.48       2.8 +/-    0.48  0.040 / 0.050
G05     68.9           65.1                4.1 +/-    0.72       4.5 +/-    0.72  0.040 / 0.040
G12     187.8          41.1                5.6 +/-    2.43       8.0 +/-    2.43  0.040 / 0.090
G13     134.1          10.6               -5.6 +/-   18.04     -15.4 +/-   18.04  0.040 / 0.090
G20     207.2          47.0                4.7 +/-    3.07       6.2 +/-    3.07  0.140 / 0.300
G21     266.6          15.0                4.3 +/-    1.39      10.6 +/-    1.39  0.140 / 0.250
G25     249.7          55.8                4.4 +/-    0.82       5.1 +/-    0.82  0.040 / 0.060
G29     325.0          49.6                2.5 +/-    2.13       3.1 +/-    2.13  0.040 / 0.070