PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-17:12:30
G02     201.8          19.5               13.7 +/-    1.74      30.6 +/-    1.74  0.170 / 0.200
G06     169.3          56.7               13.5 +/-    0.63      15.8 +/-    0.63  0.140 / 0.300
G13     227.2          11.8               12.5 +/-    2.28      33.5 +/-    2.28  0.070 / 0.130
G17     27.9           55.9               10.9 +/-    0.98      12.9 +/-    0.98  0.090 / 0.100
G19     338.0          70.5               11.4 +/-    0.33      12.0 +/-    0.33  0.160 / 0.330
G24     309.8          29.8                9.8 +/-    1.12      17.2 +/-    1.12  0.130 / 0.260
G28     90.9           38.2               12.0 +/-    0.75      18.0 +/-    0.75  0.120 / 0.510
G30     158.0          14.5               11.8 +/-    2.15      29.7 +/-    2.15  0.130 / 0.470