PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/13-12:13:10
G02     46.1           43.8                3.8 +/-    1.01       5.2 +/-    1.01  0.030 / 0.030
G05     106.4          69.5                4.8 +/-    1.10       5.1 +/-    1.10  0.030 / 0.030
G06     60.1           11.0                3.2 +/-    2.00       8.8 +/-    2.00  0.110 / 0.000
G12     192.0          54.1                6.7 +/-    1.71       8.1 +/-    1.71  0.110 / 0.380
G20     202.0          37.6                7.5 +/-    2.60      11.3 +/-    2.60  0.050 / 0.100
G21     258.7          10.5               -6.0 +/-    9.16     -16.6 +/-    9.16  0.050 / 0.090
G25     271.7          58.5                5.7 +/-    0.65       6.6 +/-    0.65  0.040 / 0.040
G29     318.9          42.1                2.9 +/-    1.93       4.0 +/-    1.93  0.040 / 0.050