PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-17:42:50
G02     201.8          17.9               13.0 +/-    1.53      30.2 +/-    1.53  0.150 / 0.330
G06     169.7          55.5               11.4 +/-    1.11      13.6 +/-    1.11  0.120 / 0.280
G13     228.0          12.6               11.6 +/-    3.53      30.6 +/-    3.53  0.090 / 0.110
G17     26.7           56.9                9.8 +/-    1.36      11.4 +/-    1.36  0.070 / 0.130
G19     334.2          70.9                9.1 +/-    0.24       9.6 +/-    0.24  0.170 / 0.300
G24     310.7          28.9                8.3 +/-    1.31      14.9 +/-    1.31  0.230 / 0.440
G28     89.5           39.0               11.1 +/-    0.91      16.4 +/-    0.91  0.170 / 0.370
G30     157.9          15.7               11.3 +/-    1.78      27.5 +/-    1.78  0.190 / 0.360