PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/03/21-07:57:50
G10     254.5          30.8                6.1 +/-    0.95      10.5 +/-    0.95  0.040 / 0.040
G13     49.5           26.6                4.1 +/-    2.62       7.7 +/-    2.62  0.040 / 0.040
G15     76.1           55.5                5.1 +/-    1.33       6.0 +/-    1.33  0.090 / 0.170
G16     296.8          13.6                2.0 +/-    1.28       5.2 +/-    1.28  0.080 / 0.150
G20     276.6          53.8                6.8 +/-    3.32       8.2 +/-    3.32  0.130 / 0.110
G21     346.0          65.2                4.9 +/-    0.85       5.3 +/-    0.85  0.120 / 0.080
G26     268.1          13.5                3.8 +/-    2.20       9.9 +/-    2.20  0.120 / 0.490
G29     162.2          39.3                6.6 +/-    0.71       9.7 +/-    0.71  0.120 / 0.360