PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-04:42:50
G05     50.5           12.1                2.3 +/-    2.43       6.2 +/-    2.43  0.070 / 0.050
G10     238.9          16.9                8.0 +/-    2.72      19.1 +/-    2.72  0.050 / 0.050
G13     69.4           35.0                4.9 +/-    0.85       7.8 +/-    0.85  0.150 / 0.280
G15     114.4          54.9                7.8 +/-    0.71       9.3 +/-    0.71  0.130 / 0.220
G16     313.4          11.8                5.5 +/-    3.23      14.8 +/-    3.23  0.210 / 0.160
G20     252.6          40.5                9.3 +/-    2.08      13.4 +/-    2.08  0.140 / 0.170
G21     319.4          51.0                5.9 +/-    0.55       7.4 +/-    0.55  0.060 / 0.130
G26     285.6          19.0                6.1 +/-    1.11      13.8 +/-    1.11  0.060 / 0.120
G29     154.3          63.0                6.4 +/-    0.46       7.1 +/-    0.46  0.030 / 0.030