PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/31-08:28:00
G02     37.2           52.0                3.0 +/-    0.51       3.8 +/-    0.51  0.090 / 0.260
G05     133.3          64.0                6.6 +/-    1.13       7.3 +/-    1.13  0.100 / 0.250
G06     54.0           17.3                2.2 +/-    0.95       5.1 +/-    0.95  0.030 / 0.030
G12     200.7          66.8                3.8 +/-    1.24       4.1 +/-    1.24  0.030 / 0.030
G20     200.7          24.2                3.0 +/-    3.28       6.0 +/-    3.28  0.030 / 0.040
G25     294.6          54.1                4.2 +/-    0.80       5.0 +/-    0.80  0.040 / 0.040
G29     309.7          31.2                3.1 +/-    1.53       5.2 +/-    1.53  0.040 / 0.050