PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-06:42:40
G10     250.2          26.1                7.0 +/-    1.77      13.3 +/-    1.77  0.040 / 0.030
G13     54.3           30.5                4.9 +/-    1.94       8.4 +/-    1.94  0.070 / 0.050
G15     86.1           57.1                5.3 +/-    1.24       6.2 +/-    1.24  0.080 / 0.310
G16     295.9          15.5                2.6 +/-    0.80       6.4 +/-    0.80  0.090 / 0.280
G20     346.6          71.9                4.6 +/-    0.35       4.8 +/-    0.35  0.030 / 0.050
G21     333.3          60.0                4.1 +/-    0.72       4.6 +/-    0.72  0.050 / 0.050
G26     267.1          15.8                5.2 +/-    1.73      12.8 +/-    1.73  0.040 / 0.030
G29     164.8          50.5                5.6 +/-    0.67       7.0 +/-    0.67  0.030 / 0.040