PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-04:57:40
G05     49.0           15.5                3.5 +/-    1.85       8.5 +/-    1.85  0.070 / 0.090
G10     236.1          13.6                6.6 +/-    2.73      16.9 +/-    2.73  0.060 / 0.080
G13     74.8           35.6                7.5 +/-    1.09      11.8 +/-    1.09  0.180 / 0.370
G15     121.8          52.7                8.7 +/-    0.84      10.6 +/-    0.84  0.180 / 0.340
G20     248.5          37.3                9.5 +/-    1.71      14.5 +/-    1.71  0.170 / 0.440
G21     315.3          48.4                6.6 +/-    0.91       8.5 +/-    0.91  0.200 / 0.300
G25     198.6          10.7                5.0 +/-    3.11      13.6 +/-    3.11  0.110 / 0.210
G26     290.2          19.2                6.7 +/-    1.03      15.1 +/-    1.03  0.110 / 0.210
G29     150.7          67.5                9.1 +/-    0.74       9.8 +/-    0.74  0.050 / 0.080