PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-08:13:10
G08     304.8          21.1                4.3 +/-    1.53       9.2 +/-    1.53  0.050 / 0.060
G10     344.6          61.6                3.2 +/-    0.41       3.6 +/-    0.41  0.050 / 0.050
G14     220.6          36.3                5.6 +/-    1.24       8.6 +/-    1.24  0.030 / 0.020
G20     47.3           58.0                5.7 +/-    0.57       6.6 +/-    0.57  0.030 / 0.020
G21     138.9          50.3                7.0 +/-    0.48       8.8 +/-    0.48  0.080 / 0.070
G24     67.0           28.7                4.0 +/-    1.06       7.2 +/-    1.06  0.110 / 0.100
G27     270.2          36.3                6.9 +/-    1.25      10.7 +/-    1.25  0.090 / 0.150
G32     227.4          52.1                7.2 +/-    2.15       8.8 +/-    2.15  0.080 / 0.160