PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-11:13:10
G01     39.8           13.9                3.1 +/-    2.00       8.0 +/-    2.00  0.060 / 0.080
G02     199.4          11.0                2.5 +/-   11.47       6.8 +/-   11.47  0.050 / 0.090
G06     176.3          40.7                9.3 +/-    1.10      13.4 +/-    1.10  0.070 / 0.210
G13     236.8          20.1                7.8 +/-    2.79      17.2 +/-    2.79  0.090 / 0.220
G15     268.6          11.4                6.3 +/-    2.13      17.0 +/-    2.13  0.120 / 0.390
G17     12.0           66.5                5.6 +/-    0.38       6.0 +/-    0.38  0.140 / 0.410
G19     292.4          71.5                7.2 +/-    1.08       7.5 +/-    1.08  0.030 / 0.030
G24     316.2          20.3                3.1 +/-    1.63       6.7 +/-    1.63  0.030 / 0.030
G28     76.3           44.8                5.6 +/-    0.64       7.6 +/-    0.64  0.050 / 0.080
G30     155.3          24.9                7.0 +/-    2.02      13.8 +/-    2.02  0.060 / 0.070