PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-06:12:40
G10     294.6          50.7                5.1 +/-    2.07       6.4 +/-    2.07  0.040 / 0.040
G15     46.4           29.9                3.1 +/-    1.42       5.5 +/-    1.42  0.040 / 0.040
G20     32.5           59.1                4.4 +/-    2.19       5.0 +/-    2.19  0.060 / 0.080
G21     88.9           75.5                6.0 +/-    0.58       6.1 +/-    0.58  0.060 / 0.080
G24     99.2           25.8                6.4 +/-    0.94      12.2 +/-    0.94  0.040 / 0.040
G27     302.0          33.6                3.1 +/-    3.27       5.1 +/-    3.27  0.040 / 0.040
G32     209.6          31.9                6.0 +/-    1.46      10.1 +/-    1.46  0.070 / 0.100