PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-19:27:40
G03     209.0          57.2               10.8 +/-    0.66      12.5 +/-    0.66  0.050 / 0.080
G07     256.3          14.4                9.5 +/-    1.62      24.0 +/-    1.62  0.070 / 0.060
G09     309.6          26.4                8.5 +/-    0.79      16.1 +/-    0.79  0.040 / 0.030
G16     99.2           64.9               11.4 +/-    1.11      12.5 +/-    1.11  0.040 / 0.040
G22     187.4          41.6               10.9 +/-    0.60      15.4 +/-    0.60  0.150 / 0.330
G23     331.2          60.5               10.0 +/-    0.58      11.3 +/-    0.58  0.150 / 0.370
G26     54.0           43.5                9.2 +/-    1.04      12.7 +/-    1.04  0.260 / 0.290
G27     133.9          10.4               -0.9 +/-   39.30      -2.5 +/-   39.30  0.230 / 0.380
G31     59.1           10.3                8.2 +/-    1.34      22.6 +/-    1.34  0.060 / 0.280