PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-13:43:00
G01     240.1          28.7                7.7 +/-    0.96      13.8 +/-    0.96  0.090 / 0.110
G03     310.7          56.9                6.9 +/-    1.62       8.1 +/-    1.62  0.100 / 0.120
G14     68.8           37.5                7.2 +/-    1.63      10.9 +/-    1.63  0.060 / 0.080
G16     156.6          29.3                8.0 +/-    1.38      14.3 +/-    1.38  0.050 / 0.080
G18     214.3          19.4                8.0 +/-    2.85      17.8 +/-    2.85  0.080 / 0.160
G22     261.7          77.8                8.5 +/-    0.56       8.7 +/-    0.56  0.080 / 0.150
G23     297.0          29.9                7.5 +/-    2.11      13.1 +/-    2.11  0.040 / 0.030
G26     121.8          46.7                8.6 +/-    0.56      11.3 +/-    0.56  0.030 / 0.030
G31     41.2           45.5                6.9 +/-    1.10       9.2 +/-    1.10  0.090 / 0.090
G32     87.0           14.9                6.2 +/-    1.56      15.5 +/-    1.56  0.070 / 0.120