PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-12:43:10
G10     247.4          23.4               13.4 +/-    2.31      27.1 +/-    2.31  0.040 / 0.050
G13     58.0           32.7                5.1 +/-    0.88       8.5 +/-    0.88  0.040 / 0.040
G15     91.3           57.0                7.7 +/-    0.45       9.0 +/-    0.45  0.030 / 0.050
G16     301.9          14.3               -2.9 +/-    1.13      -7.3 +/-    1.13  0.030 / 0.050
G18     266.0          56.0                6.8 +/-    0.93       8.1 +/-    0.93  0.110 / 0.290
G20     36.1           56.0                3.8 +/-    0.44       4.5 +/-    0.44  0.130 / 0.370
G21     333.9          60.2                3.7 +/-    0.58       4.2 +/-    0.58  0.090 / 0.330
G26     272.5          16.9                3.7 +/-    1.35       8.9 +/-    1.35  0.100 / 0.410
G29     162.3          51.5                5.7 +/-    1.75       7.1 +/-    1.75  0.060 / 0.120