PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-15:43:10
G07     317.3          51.3               10.4 +/-    1.17      12.9 +/-    1.17  0.050 / 0.050
G08     119.9          46.9               12.3 +/-    0.50      16.1 +/-    0.50  0.040 / 0.050
G09     238.6          82.8                9.7 +/-    0.85       9.8 +/-    0.85  0.110 / 0.170
G16     43.8           14.6                7.7 +/-    2.93      19.3 +/-    2.93  0.110 / 0.090
G23     149.4          49.2               12.4 +/-    0.60      15.8 +/-    0.60  0.210 / 0.310
G27     66.9           35.9                8.8 +/-    0.93      13.7 +/-    0.93  0.260 / 0.320
G28     229.5          20.7               12.9 +/-    2.07      27.9 +/-    2.07  0.030 / 0.050
G30     293.5          28.4                8.5 +/-    1.02      15.3 +/-    1.02  0.050 / 0.040