PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/14-12:12:30
G01     74.6           33.0                4.0 +/-    0.52       6.6 +/-    0.52  0.030 / 0.030
G11     55.4           30.9                2.3 +/-    1.65       4.0 +/-    1.65  0.030 / 0.030
G13     281.3          36.9                3.5 +/-    1.85       5.4 +/-    1.85  0.060 / 0.090
G15     306.8          13.9                1.8 +/-    3.18       4.6 +/-    3.18  0.080 / 0.100
G17     228.8          68.7                3.9 +/-    0.85       4.1 +/-    0.85  0.030 / 0.020
G19     221.9          40.8                6.4 +/-    1.70       9.2 +/-    1.70  0.030 / 0.020
G28     14.3           59.8                2.4 +/-    0.46       2.8 +/-    0.46  0.060 / 0.080
G30     130.2          66.6                4.5 +/-    1.22       4.9 +/-    1.22  0.270 / 0.220