PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-15:57:30
G02     201.6          21.7               12.8 +/-    1.95      27.0 +/-    1.95  0.130 / 0.220
G06     169.4          57.7               10.7 +/-    0.71      12.4 +/-    0.71  0.120 / 0.230
G13     226.5          11.0               11.8 +/-    1.48      32.2 +/-    1.48  0.090 / 0.130
G17     29.1           55.0                9.0 +/-    0.97      10.7 +/-    0.97  0.120 / 0.110
G19     341.4          70.0               10.2 +/-    0.89      10.7 +/-    0.89  0.110 / 0.370
G24     309.0          30.6                6.7 +/-    1.28      11.7 +/-    1.28  0.150 / 0.390
G28     92.3           37.4                9.4 +/-    1.01      14.3 +/-    1.01  0.040 / 0.040
G30     158.0          13.1               12.6 +/-    2.86      32.9 +/-    2.86  0.030 / 0.050