PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-17:27:30
G07     305.2          45.3               11.5 +/-    1.36      15.4 +/-    1.36  0.050 / 0.070
G08     133.9          38.9               14.8 +/-    1.15      22.0 +/-    1.15  0.050 / 0.090
G09     306.8          77.0               10.8 +/-    1.06      11.1 +/-    1.06  0.040 / 0.050
G16     41.9           24.1                8.4 +/-    1.21      16.7 +/-    1.21  0.030 / 0.060
G23     142.1          60.0               14.3 +/-    1.04      16.2 +/-    1.04  0.110 / 0.420
G27     80.0           37.1               11.2 +/-    0.92      17.1 +/-    0.92  0.120 / 0.560
G28     223.6          12.0                9.5 +/-   18.85      25.3 +/-   18.85  0.040 / 0.070
G30     285.7          22.8               10.8 +/-    1.91      22.2 +/-    1.91  0.040 / 0.070