PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-23:42:40
G07     318.0          51.7                7.5 +/-    1.69       9.2 +/-    1.69  0.070 / 0.200
G08     117.9          47.1               10.0 +/-    0.76      13.1 +/-    0.76  0.070 / 0.190
G09     246.2          82.6                7.1 +/-    0.87       7.2 +/-    0.87  0.030 / 0.060
G16     43.5           17.7                3.9 +/-    1.19       9.0 +/-    1.19  0.040 / 0.060
G23     150.6          52.9                9.6 +/-    0.70      11.8 +/-    0.70  0.100 / 0.280
G27     66.0           35.5                5.5 +/-    0.73       8.7 +/-    0.73  0.090 / 0.300
G28     229.8          21.4                9.9 +/-    1.70      21.1 +/-    1.70  0.030 / 0.060
G30     295.0          30.9                8.2 +/-    1.06      14.2 +/-    1.06  0.030 / 0.070