PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-17:28:10
G07     326.1          55.2               11.3 +/-    0.82      13.4 +/-    0.82  0.040 / 0.060
G08     111.7          50.8               14.6 +/-    0.49      18.3 +/-    0.49  0.030 / 0.060
G09     203.0          78.3               10.5 +/-    0.62      10.7 +/-    0.62  0.060 / 0.210
G11     149.7          10.1               -5.7 +/-   16.76     -15.9 +/-   16.76  0.070 / 0.220
G23     152.3          41.2               13.8 +/-    1.36      19.7 +/-    1.36  0.040 / 0.080
G27     59.0           33.4               11.0 +/-    0.63      18.0 +/-    0.63  0.030 / 0.070
G28     234.2          26.4               13.3 +/-    0.85      25.1 +/-    0.85  0.030 / 0.050
G30     299.4          33.5               11.8 +/-    1.72      19.2 +/-    1.72  0.040 / 0.070