PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/21-19:57:40
G10     274.1          41.5               16.6 +/-    2.05      23.6 +/-    2.05  0.070 / 0.140
G13     39.8           14.5               12.4 +/-    2.27      31.4 +/-    2.27  0.070 / 0.150
G15     53.0           42.9               14.7 +/-    0.75      20.4 +/-    0.75  0.030 / 0.040
G18     318.0          66.5               13.1 +/-    0.76      14.2 +/-    0.76  0.030 / 0.050
G20     58.9           30.5               15.1 +/-    0.79      26.1 +/-    0.79  0.130 / 0.220
G21     34.2           75.7               15.1 +/-    0.64      15.5 +/-    0.64  0.130 / 0.280
G24     115.9          17.8               19.6 +/-    1.77      45.6 +/-    1.77  0.140 / 0.300
G27     314.1          25.1               14.2 +/-    1.60      27.7 +/-    1.60  0.070 / 0.270
G29     166.1          19.1               16.2 +/-    1.28      36.5 +/-    1.28  0.060 / 0.150
G32     206.3          12.9               16.7 +/-    1.98      43.6 +/-    1.98  0.060 / 0.150