PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/23-07:43:10
G02     55.1           35.7                2.5 +/-    0.62       4.0 +/-    0.62  0.040 / 0.090
G05     70.0           65.4                6.4 +/-    0.39       6.9 +/-    0.39  0.050 / 0.080
G12     187.9          41.7                5.9 +/-    1.79       8.3 +/-    1.79  0.130 / 0.280
G20     207.1          46.0                5.0 +/-    2.11       6.7 +/-    2.11  0.140 / 0.220
G21     266.0          14.4                4.5 +/-    1.41      11.3 +/-    1.41  0.040 / 0.060
G25     250.9          56.1                4.7 +/-    0.66       5.6 +/-    0.66  0.070 / 0.060
G29     324.4          48.9                3.7 +/-    1.51       4.7 +/-    1.51  0.030 / 0.030