PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-16:42:30
G07     305.2          45.3               10.3 +/-    1.24      13.8 +/-    1.24  0.050 / 0.100
G08     133.1          39.1               12.9 +/-    1.10      19.0 +/-    1.10  0.050 / 0.110
G09     306.6          77.3                8.9 +/-    1.30       9.1 +/-    1.30  0.030 / 0.060
G16     41.9           23.9                8.3 +/-    0.80      16.6 +/-    0.80  0.030 / 0.060
G23     142.0          59.3               12.3 +/-    0.85      14.0 +/-    0.85  0.040 / 0.070
G27     80.1           37.1                9.3 +/-    1.00      14.1 +/-    1.00  0.040 / 0.080
G28     223.6          12.0                7.8 +/-   14.28      20.8 +/-   14.28  0.110 / 0.530
G30     285.6          22.5                9.4 +/-    2.59      19.5 +/-    2.59  0.120 / 0.430