PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-07:28:00
G08     320.7          11.1               -5.2 +/-   28.56     -14.1 +/-   28.56  0.060 / 0.050
G10     306.2          54.9                3.5 +/-    0.99       4.2 +/-    0.99  0.040 / 0.050
G14     211.1          16.8                5.0 +/-    2.72      11.9 +/-    2.72  0.030 / 0.040
G15     45.5           22.5                2.1 +/-    0.72       4.4 +/-    0.72  0.040 / 0.040
G20     4.9            64.7                4.3 +/-    0.62       4.7 +/-    0.62  0.140 / 0.110
G21     111.7          69.0                5.5 +/-    1.32       5.9 +/-    1.32  0.080 / 0.080
G24     91.0           28.0                4.7 +/-    0.82       8.6 +/-    0.82  0.080 / 0.250
G27     296.6          35.3                5.7 +/-    0.92       9.1 +/-    0.92  0.100 / 0.320
G32     213.3          32.1                6.1 +/-    1.49      10.2 +/-    1.49  0.120 / 0.150