PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-23:43:00
G07     318.0          51.7                7.8 +/-    0.69       9.7 +/-    0.69  0.140 / 0.250
G08     117.9          47.1               10.5 +/-    0.88      13.8 +/-    0.88  0.290 / 0.280
G09     246.2          82.6                9.6 +/-    1.27       9.6 +/-    1.27  0.140 / 0.280
G16     43.5           17.7                4.7 +/-    3.20      10.8 +/-    3.20  0.210 / 0.440
G23     150.6          52.9               10.5 +/-    0.63      12.8 +/-    0.63  0.040 / 0.060
G27     66.0           35.5                7.6 +/-    1.39      12.0 +/-    1.39  0.030 / 0.040
G28     229.8          21.4               10.7 +/-    3.08      22.8 +/-    3.08  0.050 / 0.050
G30     295.0          30.9                9.2 +/-    1.27      15.8 +/-    1.27  0.040 / 0.060