PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-21:42:50
G03     206.3          52.6                9.5 +/-    1.15      11.6 +/-    1.15  0.050 / 0.090
G07     260.7          18.1               10.0 +/-    1.85      23.0 +/-    1.85  0.050 / 0.090
G09     312.3          31.1                9.0 +/-    0.77      15.4 +/-    0.77  0.090 / 0.270
G16     86.8           65.4               10.9 +/-    0.65      11.9 +/-    0.65  0.070 / 0.230
G22     186.6          36.8               11.1 +/-    1.70      17.0 +/-    1.70  0.030 / 0.050
G23     335.3          64.3                9.3 +/-    0.63      10.2 +/-    0.63  0.030 / 0.050
G26     50.2           40.1                8.0 +/-    0.86      11.6 +/-    0.86  0.200 / 0.350
G27     129.6          14.2               11.4 +/-    2.83      28.9 +/-    2.83  0.210 / 0.330