PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/07-11:27:50
G01     112.4          22.3                4.4 +/-    1.78       9.1 +/-    1.78  0.030 / 0.020
G07     98.8           59.9                6.1 +/-    0.87       6.9 +/-    0.87  0.030 / 0.020
G08     42.5           23.5                3.3 +/-    2.54       6.7 +/-    2.54  0.030 / 0.030
G09     174.3          17.0                5.5 +/-    1.21      13.1 +/-    1.21  0.030 / 0.040
G11     94.8           40.5                6.1 +/-    1.04       8.8 +/-    1.04  0.090 / 0.210
G17     203.0          34.4                8.6 +/-    1.08      13.9 +/-    1.08  0.080 / 0.160
G28     307.2          59.7                5.1 +/-    0.63       5.8 +/-    0.63  0.120 / 0.100
G30     357.9          73.1                6.1 +/-    1.19       6.4 +/-    1.19  0.080 / 0.080