PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-14:42:40
G08     319.4          12.0                2.2 +/-    3.51       5.8 +/-    3.51  0.060 / 0.080
G10     309.8          55.3               19.8 +/-    0.53      23.6 +/-    0.53  0.060 / 0.070
G14     213.0          19.0                6.1 +/-    1.22      13.8 +/-    1.22  0.110 / 0.450
G15     45.4           19.3                4.0 +/-    0.53       9.0 +/-    0.53  0.130 / 0.390
G18     22.0           62.9                4.0 +/-    0.47       4.5 +/-    0.47  0.030 / 0.050
G20     76.1           16.3                5.9 +/-    1.33      14.1 +/-    1.33  0.030 / 0.040
G21     119.7          64.3                8.4 +/-    0.36       9.2 +/-    0.36  0.080 / 0.100
G24     89.1           29.3                7.1 +/-    0.73      12.6 +/-    0.73  0.080 / 0.110
G27     289.1          37.4                4.8 +/-    0.65       7.3 +/-    0.65  0.040 / 0.060
G32     214.9          40.5                6.0 +/-    1.50       8.7 +/-    1.50  0.040 / 0.050