PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-09:43:00
G01     320.6          13.8              -13.0 +/-   26.67     -33.3 +/-   26.67  0.110 / 0.280
G08     262.3          16.2                7.8 +/-    1.17      18.8 +/-    1.17  0.130 / 0.320
G10     71.4           55.1                5.9 +/-    0.62       7.1 +/-    0.62  0.090 / 0.310
G11     307.3          20.7                6.0 +/-    2.45      13.0 +/-    2.45  0.090 / 0.170
G14     280.7          69.6                6.5 +/-    0.64       6.9 +/-    0.64  0.040 / 0.030
G18     308.4          37.9                6.7 +/-    0.72      10.2 +/-    0.72  0.030 / 0.030
G20     100.5          32.9                5.9 +/-    0.63       9.7 +/-    0.63  0.140 / 0.340
G27     229.5          13.1                5.3 +/-    1.90      13.8 +/-    1.90  0.100 / 0.310
G31     177.7          35.0                7.4 +/-    2.09      11.8 +/-    2.09  0.040 / 0.050
G32     337.5          72.9                7.2 +/-    0.48       7.5 +/-    0.48  0.040 / 0.050