PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-07:58:00
G08     297.6          22.7                4.3 +/-    1.27       8.9 +/-    1.27  0.040 / 0.070
G10     0.9            62.6                4.4 +/-    0.44       4.9 +/-    0.44  0.050 / 0.070
G14     225.9          43.3                8.3 +/-    0.98      11.5 +/-    0.98  0.060 / 0.120
G20     59.5           54.3                4.5 +/-    0.46       5.4 +/-    0.46  0.050 / 0.110
G21     144.1          43.2                7.9 +/-    0.88      11.0 +/-    0.88  0.130 / 0.130
G24     59.3           26.6                4.0 +/-    0.56       7.5 +/-    0.56  0.100 / 0.090
G27     260.8          33.8                6.2 +/-    0.88      10.1 +/-    0.88  0.030 / 0.030
G32     236.0          59.5                8.6 +/-    0.57       9.9 +/-    0.57  0.030 / 0.030