PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-20:27:50
G07     312.5          50.5               12.6 +/-    1.02      15.8 +/-    1.02  0.040 / 0.060
G08     123.6          42.0               14.5 +/-    0.47      20.5 +/-    0.47  0.030 / 0.060
G09     299.6          79.7               13.8 +/-    0.58      14.0 +/-    0.58  0.030 / 0.020
G16     42.1           27.1                8.2 +/-    2.20      15.3 +/-    2.20  0.020 / 0.030
G23     145.8          64.2               14.3 +/-    0.35      15.7 +/-    0.35  0.060 / 0.050
G27     80.7           38.1               12.9 +/-    0.67      19.4 +/-    0.67  0.060 / 0.060
G30     286.7          22.8               12.3 +/-    1.33      25.4 +/-    1.33  0.050 / 0.070