PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/22-07:58:00
G07     313.8          50.1                3.3 +/-    0.71       4.1 +/-    0.71  0.030 / 0.030
G08     120.4          43.9                6.9 +/-    0.68       9.4 +/-    0.68  0.030 / 0.030
G09     271.5          83.8                3.8 +/-    0.35       3.8 +/-    0.35  0.030 / 0.040
G16     42.2           24.0                2.6 +/-    1.78       5.1 +/-    1.78  0.030 / 0.040
G23     147.7          61.3                5.9 +/-    0.49       6.6 +/-    0.49  0.020 / 0.020
G27     72.5           36.4                4.1 +/-    1.19       6.4 +/-    1.19  0.020 / 0.020
G28     226.4          16.6                3.9 +/-    9.03       9.3 +/-    9.03  0.090 / 0.120
G30     288.3          23.5                4.5 +/-    2.04       9.1 +/-    2.04  0.130 / 0.190