PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-14:13:10
G03     249.1          70.6                8.3 +/-    0.40       8.8 +/-    0.40  0.090 / 0.210
G09     299.9          13.7                6.0 +/-    5.40      15.4 +/-    5.40  0.110 / 0.220
G14     93.7           21.4                6.6 +/-    2.05      13.9 +/-    2.05  0.060 / 0.060
G16     133.3          55.0               10.1 +/-    0.46      12.1 +/-    0.46  0.050 / 0.060
G22     190.9          57.5                8.0 +/-    0.89       9.3 +/-    0.89  0.040 / 0.040
G23     318.6          49.0                7.6 +/-    0.60       9.7 +/-    0.60  0.040 / 0.050
G26     75.9           52.6                7.5 +/-    0.95       9.2 +/-    0.95  0.030 / 0.040
G31     50.1           22.1                5.7 +/-    3.28      11.9 +/-    3.28  0.040 / 0.040