PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-07:27:50
G10     280.5          45.0                6.1 +/-    0.83       8.2 +/-    0.83  0.040 / 0.040
G15     49.8           38.5                5.0 +/-    1.06       7.5 +/-    1.06  0.040 / 0.050
G20     37.7           55.6                5.8 +/-    1.12       6.9 +/-    1.12  0.060 / 0.090
G21     44.0           77.1                5.7 +/-    0.57       5.9 +/-    0.57  0.070 / 0.090
G24     110.0          20.8                7.5 +/-    1.13      16.1 +/-    1.13  0.030 / 0.030
G27     311.3          27.9                4.0 +/-    1.60       7.3 +/-    1.60  0.030 / 0.040
G29     168.7          19.3                7.0 +/-    1.32      15.6 +/-    1.32  0.100 / 0.160
G32     206.2          21.6                6.5 +/-    0.80      13.8 +/-    0.80  0.090 / 0.160