PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/16-08:27:50
G10     294.4          50.6                5.3 +/-    2.62       6.6 +/-    2.62  0.060 / 0.050
G15     46.3           29.1                3.6 +/-    1.16       6.5 +/-    1.16  0.060 / 0.050
G20     54.7           44.3                5.4 +/-    0.67       7.4 +/-    0.67  0.040 / 0.060
G21     90.5           74.9                6.0 +/-    0.31       6.1 +/-    0.31  0.050 / 0.060
G24     99.7           25.8                6.1 +/-    1.42      11.8 +/-    1.42  0.040 / 0.040
G27     301.8          33.8                4.3 +/-    2.68       7.0 +/-    2.68  0.040 / 0.030
G32     209.6          31.7                5.6 +/-    1.14       9.5 +/-    1.14  0.090 / 0.050