PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/29-04:28:00
G05     49.4           14.5                2.7 +/-    0.93       6.7 +/-    0.93  0.050 / 0.080
G10     236.9          14.6                6.4 +/-    1.79      16.1 +/-    1.79  0.070 / 0.070
G13     73.2           35.5                6.3 +/-    1.08       9.9 +/-    1.08  0.090 / 0.260
G15     119.7          53.4                7.2 +/-    0.69       8.7 +/-    0.69  0.140 / 0.290
G16     315.9          10.9               -0.8 +/-   12.94      -2.1 +/-   12.94  0.110 / 0.200
G20     249.7          38.3                7.8 +/-    1.26      11.7 +/-    1.26  0.140 / 0.180
G21     316.2          49.0                6.0 +/-    0.86       7.7 +/-    0.86  0.060 / 0.090
G26     288.6          19.3                5.3 +/-    0.84      11.8 +/-    0.84  0.060 / 0.110
G29     152.0          66.6                6.7 +/-    0.55       7.2 +/-    0.55  0.030 / 0.040