PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/31-08:27:50
G02     37.2           52.0                3.3 +/-    1.11       4.1 +/-    1.11  0.020 / 0.030
G05     133.3          64.0                5.7 +/-    0.48       6.3 +/-    0.48  0.030 / 0.020
G06     54.0           17.3                1.6 +/-    2.39       3.8 +/-    2.39  0.030 / 0.030
G12     200.7          66.8                4.8 +/-    0.52       5.2 +/-    0.52  0.030 / 0.030
G20     200.7          24.2                5.1 +/-    3.74      10.1 +/-    3.74  0.150 / 0.260
G25     294.6          54.1                4.2 +/-    2.56       5.0 +/-    2.56  0.140 / 0.240
G29     309.7          31.2                3.5 +/-    1.73       5.9 +/-    1.73  0.040 / 0.040