PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-19:42:50
G01     312.5          28.3                8.2 +/-    1.18      14.8 +/-    1.18  0.090 / 0.200
G10     97.8           45.6                9.8 +/-    0.97      13.1 +/-    0.97  0.080 / 0.190
G11     290.6          27.2                8.8 +/-    1.62      16.3 +/-    1.62  0.030 / 0.030
G14     339.1          69.7                9.6 +/-    0.59      10.2 +/-    0.59  0.020 / 0.040
G18     112.9          18.0                8.6 +/-    1.32      19.8 +/-    1.32  0.210 / 0.270
G22     306.7          19.8                8.9 +/-    1.98      19.7 +/-    1.98  0.420 / 0.330
G25     88.9           14.3               10.7 +/-    3.18      27.2 +/-    3.18  0.030 / 0.030
G31     173.7          55.8               11.7 +/-    0.49      13.9 +/-    0.49  0.030 / 0.030
G32     26.9           58.2                8.9 +/-    0.91      10.2 +/-    0.91  0.040 / 0.030