PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/19-13:12:40
G01     231.3          22.6                5.8 +/-    2.76      11.9 +/-    2.76  0.130 / 0.250
G03     296.9          67.9              -45.9 +/-    8.88     -49.1 +/-    8.88  0.140 / 0.230
G14     79.8           28.2                5.7 +/-    1.93      10.5 +/-    1.93  0.080 / 0.110
G16     155.8          35.0                7.5 +/-    1.06      11.8 +/-    1.06  0.070 / 0.140
G18     206.0          11.3                2.6 +/-    9.68       6.9 +/-    9.68  0.090 / 0.160
G22     221.5          74.7                7.4 +/-    0.99       7.6 +/-    0.99  0.090 / 0.140
G23     301.7          32.3                5.7 +/-    2.69       9.5 +/-    2.69  0.110 / 0.300
G26     115.7          51.8                8.5 +/-    0.73      10.5 +/-    0.73  0.110 / 0.340
G31     42.7           39.7                5.5 +/-    1.15       8.1 +/-    1.15  0.030 / 0.030
G32     91.5           14.8                6.1 +/-    1.66      15.3 +/-    1.66  0.030 / 0.030