PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-23:12:30
G07     31.7           69.5               10.5 +/-    0.57      11.2 +/-    0.57  0.120 / 0.110
G08     58.1           46.5                8.9 +/-    0.66      11.7 +/-    0.66  0.110 / 0.110
G09     180.0          44.1               12.0 +/-    0.98      16.3 +/-    0.98  0.030 / 0.040
G11     128.0          30.5               12.4 +/-    1.56      21.5 +/-    1.56  0.050 / 0.060
G23     160.0          12.4                9.7 +/-    2.26      25.6 +/-    2.26  0.350 / 0.170
G27     38.2           11.7                8.4 +/-    3.23      22.7 +/-    3.23  0.140 / 0.410
G28     267.4          49.8               10.2 +/-    4.48      13.0 +/-    4.48  0.020 / 0.030
G30     331.2          58.6                9.1 +/-    0.41      10.4 +/-    0.41  0.020 / 0.030