PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-18:28:00
G01     317.0          22.8                8.0 +/-    2.94      16.5 +/-    2.94  0.100 / 0.160
G08     250.5          10.2                8.9 +/-    2.11      24.7 +/-    2.11  0.090 / 0.170
G10     88.5           49.2               11.3 +/-    0.45      14.4 +/-    0.45  0.060 / 0.050
G11     296.4          26.1                9.1 +/-    1.62      17.3 +/-    1.62  0.060 / 0.050
G14     317.6          71.5               10.3 +/-    0.58      10.8 +/-    0.58  0.030 / 0.040
G18     295.6          46.9               10.1 +/-    1.53      13.2 +/-    1.53  0.030 / 0.050
G20     110.2          24.8               10.9 +/-    0.98      21.3 +/-    0.98  0.090 / 0.170
G22     303.7          14.3                7.9 +/-    1.79      20.1 +/-    1.79  0.090 / 0.180
G31     178.3          44.9               14.6 +/-    1.03      19.6 +/-    1.03  0.090 / 0.270
G32     15.4           64.1                9.4 +/-    0.92      10.3 +/-    0.92  0.130 / 0.380