PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-11:57:50
G10     285.0          46.8                3.8 +/-    1.46       5.0 +/-    1.46  0.060 / 0.130
G15     48.0           34.5                2.5 +/-    0.76       4.0 +/-    0.76  0.050 / 0.120
G20     62.8           29.0                1.9 +/-    1.21       3.5 +/-    1.21  0.040 / 0.040
G21     69.1           76.1                5.4 +/-    0.55       5.6 +/-    0.55  0.040 / 0.050
G24     107.3          22.6                5.2 +/-    1.82      10.8 +/-    1.82  0.060 / 0.090
G27     308.0          30.4                5.5 +/-    1.48       9.5 +/-    1.48  0.060 / 0.070
G29     168.0          14.3                6.2 +/-    2.28      15.5 +/-    2.28  0.110 / 0.240
G32     207.5          24.2                3.8 +/-    1.92       7.6 +/-    1.92  0.080 / 0.200