PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/17-21:28:10
G10     280.1          45.2               12.4 +/-    1.65      16.7 +/-    1.65  0.070 / 0.160
G15     52.5           44.7               10.2 +/-    0.44      13.8 +/-    0.44  0.070 / 0.130
G20     321.4          64.2               10.7 +/-    0.81      11.7 +/-    0.81  0.040 / 0.040
G21     41.5           76.9               13.0 +/-    0.48      13.3 +/-    0.48  0.040 / 0.040
G24     107.9          20.6               13.9 +/-    0.94      30.1 +/-    0.94  0.110 / 0.130
G27     312.8          26.2               10.8 +/-    1.05      20.6 +/-    1.05  0.100 / 0.160
G29     168.7          20.2               14.9 +/-    2.69      32.6 +/-    2.69  0.030 / 0.060
G32     206.1          20.6               14.6 +/-    1.97      31.6 +/-    1.97  0.030 / 0.060