PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-21:43:10
G08     301.0          22.1                9.8 +/-    1.59      20.4 +/-    1.59  0.060 / 0.090
G10     346.7          61.8               12.3 +/-    0.61      13.8 +/-    0.61  0.070 / 0.100
G14     223.3          39.7               15.7 +/-    0.91      22.9 +/-    0.91  0.060 / 0.080
G18     52.2           55.2               13.1 +/-    0.49      15.6 +/-    0.49  0.050 / 0.100
G21     140.6          46.2               16.2 +/-    0.83      21.4 +/-    0.83  0.030 / 0.040
G24     66.1           29.5               13.8 +/-    0.58      24.4 +/-    0.58  0.030 / 0.040
G27     262.6          35.3               14.6 +/-    1.76      23.0 +/-    1.76  0.050 / 0.070
G32     231.7          57.1               15.5 +/-    0.83      18.1 +/-    0.83  0.040 / 0.080