PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-06:57:50
G08     320.1          11.7                2.1 +/-    1.38       5.7 +/-    1.38  0.030 / 0.050
G10     308.3          55.5                5.2 +/-    0.96       6.1 +/-    0.96  0.040 / 0.050
G14     211.5          17.9                4.0 +/-    1.36       9.3 +/-    1.36  0.100 / 0.320
G15     45.5           21.4                2.1 +/-    0.61       4.4 +/-    0.61  0.140 / 0.580
G20     7.7            64.5                5.5 +/-    0.53       6.0 +/-    0.53  0.080 / 0.090
G21     114.0          68.3                6.7 +/-    0.48       7.1 +/-    0.48  0.070 / 0.090
G24     89.8           28.3                5.8 +/-    0.79      10.6 +/-    0.79  0.040 / 0.030
G27     295.1          35.7                6.1 +/-    0.81       9.5 +/-    0.81  0.040 / 0.040
G32     213.9          33.6                8.4 +/-    2.11      13.7 +/-    2.11  0.120 / 0.280