PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/21-15:58:00
G05     46.6           24.1               11.3 +/-    1.53      22.5 +/-    1.53  0.050 / 0.080
G13     87.0           36.8               14.4 +/-    0.86      22.1 +/-    0.86  0.110 / 0.220
G15     132.4          47.2               18.0 +/-    0.87      23.6 +/-    0.87  0.050 / 0.070
G18     239.4          37.7               14.9 +/-    1.66      22.5 +/-    1.66  0.060 / 0.070
G20     14.7           75.3               13.1 +/-    0.60      13.5 +/-    0.60  0.030 / 0.030
G21     309.3          45.8               12.8 +/-    0.74      17.1 +/-    0.74  0.030 / 0.030
G25     202.6          16.1               16.8 +/-    2.83      40.6 +/-    2.83  0.070 / 0.180
G26     298.3          18.9               10.1 +/-    1.80      22.8 +/-    1.80  0.090 / 0.170
G29     143.8          74.6               14.5 +/-    0.45      15.0 +/-    0.45  0.100 / 0.180