PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-14:27:50
G03     230.7          67.5                8.1 +/-    0.48       8.7 +/-    0.48  0.100 / 0.280
G09     303.6          18.1                7.0 +/-    1.40      16.2 +/-    1.40  0.140 / 0.310
G14     99.0           17.4                7.0 +/-    1.83      16.4 +/-    1.83  0.040 / 0.060
G16     122.6          59.8               10.0 +/-    0.46      11.4 +/-    0.46  0.040 / 0.050
G22     187.6          50.8                8.1 +/-    0.51      10.2 +/-    0.51  0.030 / 0.030
G23     324.1          53.9                7.8 +/-    0.65       9.5 +/-    0.65  0.030 / 0.040
G26     66.1           49.9                8.4 +/-    0.72      10.6 +/-    0.72  0.050 / 0.060
G31     53.1           17.3                6.7 +/-    3.09      15.7 +/-    3.09  0.050 / 0.050