PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-19:57:40
G03     198.7          43.5               11.4 +/-    1.45      15.8 +/-    1.45  0.080 / 0.150
G07     267.2          22.7                7.9 +/-    3.15      16.3 +/-    3.15  0.080 / 0.120
G09     315.6          37.8                8.7 +/-    0.95      13.2 +/-    0.95  0.030 / 0.040
G16     65.7           61.0               10.3 +/-    1.06      11.6 +/-    1.06  0.040 / 0.050
G22     183.4          27.9               10.2 +/-    1.55      18.6 +/-    1.55  0.110 / 0.170
G23     348.4          72.3                9.6 +/-    0.54      10.0 +/-    0.54  0.090 / 0.180
G26     45.7           32.4                7.5 +/-    0.50      12.5 +/-    0.50  0.090 / 0.210
G27     123.4          19.5               12.0 +/-    1.54      26.7 +/-    1.54  0.090 / 0.190