PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-21:27:50
G05     47.5           20.8                9.9 +/-    2.42      21.4 +/-    2.42  0.200 / 0.310
G13     80.8           36.3               12.8 +/-    0.96      19.8 +/-    0.96  0.210 / 0.210
G15     135.6          48.7               13.2 +/-    0.48      17.0 +/-    0.48  0.060 / 0.080
G16     316.1          12.0                9.4 +/-    4.02      25.2 +/-    4.02  0.090 / 0.060
G20     238.4          2.3                 6.7 +/-    1.54      20.8 +/-    1.54  0.310 / 0.530
G21     308.5          43.4               11.8 +/-    1.10      16.3 +/-    1.10  0.250 / 0.330
G25     200.7          13.7               16.7 +/-    1.35      42.8 +/-    1.35  0.200 / 0.430
G26     290.0          21.2               11.9 +/-    1.36      25.4 +/-    1.36  0.210 / 0.410
G29     151.8          78.6               12.4 +/-    0.36      12.6 +/-    0.36  0.080 / 0.110