PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/15-08:27:40
G08     119.6          44.3                7.9 +/-    0.41      10.7 +/-    0.41  0.040 / 0.050
G09     262.3          84.2                5.2 +/-    0.17       5.2 +/-    0.17  0.040 / 0.050
G16     42.3           23.1                3.0 +/-    1.95       6.2 +/-    1.95  0.030 / 0.040
G23     148.2          60.6                7.6 +/-    0.52       8.5 +/-    0.52  0.030 / 0.040
G27     71.7           36.3                5.1 +/-    0.78       7.9 +/-    0.78  0.050 / 0.050
G28     226.8          17.1                7.2 +/-    4.33      17.0 +/-    4.33  0.070 / 0.060
G30     288.7          23.8                5.7 +/-    1.61      11.4 +/-    1.61  0.120 / 0.160