PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-05:12:40
G02     86.1           10.8                2.6 +/-    2.43       7.1 +/-    2.43  0.040 / 0.110
G05     45.2           28.8                0.8 +/-    0.70       1.5 +/-    0.70  0.050 / 0.090
G13     96.5           34.2                5.1 +/-    0.70       8.2 +/-    0.70  0.100 / 0.200
G15     142.0          40.3                5.9 +/-    1.39       8.6 +/-    1.39  0.120 / 0.230
G20     243.0          58.4                6.6 +/-    1.16       7.6 +/-    1.16  0.040 / 0.060
G21     298.9          37.2                5.1 +/-    1.72       7.8 +/-    1.72  0.040 / 0.050
G25     208.6          24.2                4.6 +/-    2.20       9.2 +/-    2.20  0.100 / 0.340
G26     302.2          19.7                4.6 +/-    1.42      10.1 +/-    1.42  0.130 / 0.460
G29     47.4           87.4                3.5 +/-    0.44       3.5 +/-    0.44  0.030 / 0.030