PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/09-04:28:00
G05     47.1           20.9                4.1 +/-    2.82       8.8 +/-    2.82  0.210 / 0.220
G13     84.7           36.4                8.5 +/-    1.00      13.2 +/-    1.00  0.090 / 0.200
G15     132.8          47.7                8.4 +/-    0.55      10.9 +/-    0.55  0.060 / 0.070
G20     251.0          56.5                7.8 +/-    1.14       9.2 +/-    1.14  0.080 / 0.070
G21     306.8          42.6                6.1 +/-    1.30       8.5 +/-    1.30  0.170 / 0.260
G25     203.4          16.4                6.6 +/-    3.98      15.8 +/-    3.98  0.150 / 0.200
G26     292.9          21.0                7.1 +/-    1.33      15.3 +/-    1.33  0.020 / 0.020
G29     147.8          80.4                7.4 +/-    0.27       7.5 +/-    0.27  0.020 / 0.020