PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-08:27:40
G08     302.3          21.9                3.9 +/-    1.64       8.3 +/-    1.64  0.040 / 0.060
G10     350.1          62.1                4.8 +/-    1.02       5.4 +/-    1.02  0.040 / 0.070
G14     222.3          38.8                5.9 +/-    2.04       8.8 +/-    2.04  0.080 / 0.120
G20     51.7           56.8                5.9 +/-    1.22       6.9 +/-    1.22  0.090 / 0.150
G21     140.9          47.6                6.5 +/-    0.80       8.5 +/-    0.80  0.090 / 0.050
G24     64.2           28.1                3.1 +/-    1.40       5.6 +/-    1.40  0.080 / 0.080
G27     266.9          35.6                6.5 +/-    2.08      10.3 +/-    2.08  0.030 / 0.030
G32     230.0          54.5                5.6 +/-    3.06       6.7 +/-    3.06  0.030 / 0.030