PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-08:58:10
G08     313.5          15.9                3.7 +/-    2.64       8.9 +/-    2.64  0.080 / 0.290
G10     329.6          59.6                2.6 +/-    0.39       3.0 +/-    0.39  0.080 / 0.210
G14     218.0          26.3                4.5 +/-    1.82       8.5 +/-    1.82  0.080 / 0.080
G15     46.7           10.8                2.8 +/-    1.10       7.8 +/-    1.10  0.060 / 0.080
G20     73.2           32.3                3.4 +/-    0.81       5.7 +/-    0.81  0.070 / 0.080
G21     133.3          57.8                5.0 +/-    0.82       5.7 +/-    0.82  0.060 / 0.080
G24     75.2           30.1                3.6 +/-    0.63       6.3 +/-    0.63  0.070 / 0.110
G27     275.4          37.6                5.9 +/-    0.79       9.0 +/-    0.79  0.060 / 0.150
G32     222.5          53.0                5.3 +/-    1.06       6.5 +/-    1.06  0.030 / 0.040