PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/23-21:57:30
G07     331.0          57.1               12.8 +/-    0.68      15.0 +/-    0.68  0.030 / 0.050
G08     104.8          52.1               17.0 +/-    1.13      20.9 +/-    1.13  0.040 / 0.050
G09     197.1          75.5               15.6 +/-    1.00      16.0 +/-    1.00  0.080 / 0.160
G11     148.9          11.6               23.4 +/-    7.87      63.0 +/-    7.87  0.060 / 0.150
G23     154.6          41.0               18.0 +/-    0.96      25.7 +/-    0.96  0.070 / 0.090
G27     55.3           31.6               12.8 +/-    0.55      21.7 +/-    0.55  0.070 / 0.090
G28     236.9          29.4               14.6 +/-    1.63      25.9 +/-    1.63  0.040 / 0.050
G30     303.6          37.8               13.1 +/-    0.88      19.8 +/-    0.88  0.040 / 0.040