PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-12:12:40
G07     316.4          51.6                2.9 +/-    0.39       3.6 +/-    0.39  0.030 / 0.020
G08     119.3          44.3                5.5 +/-    1.11       7.5 +/-    1.11  0.030 / 0.020
G09     267.4          83.9                4.6 +/-    0.32       4.6 +/-    0.32  0.030 / 0.040
G16     42.5           21.1                3.7 +/-    2.22       7.9 +/-    2.22  0.030 / 0.040
G23     147.9          60.1                5.4 +/-    0.41       6.2 +/-    0.41  0.120 / 0.150
G27     71.7           36.3                4.4 +/-    1.10       6.7 +/-    1.10  0.110 / 0.130
G28     226.8          16.8                3.9 +/-    6.65       9.3 +/-    6.65  0.030 / 0.040
G30     288.3          23.0                4.2 +/-    1.43       8.6 +/-    1.43  0.030 / 0.040