PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-16:43:10
G07     15.1           68.2               13.6 +/-    0.37      14.5 +/-    0.37  0.040 / 0.060
G08     64.9           49.6               13.1 +/-    0.51      16.6 +/-    0.51  0.040 / 0.050
G09     179.8          49.4               15.2 +/-    0.56      19.4 +/-    0.56  0.040 / 0.030
G11     130.8          27.4               12.4 +/-    1.09      22.9 +/-    1.09  0.030 / 0.030
G18     114.8          10.2                0.9 +/-   29.74       2.4 +/-   29.74  0.040 / 0.040
G23     158.7          15.7               12.2 +/-    1.65      29.9 +/-    1.65  0.050 / 0.040
G27     40.3           16.7               10.7 +/-    1.84      25.6 +/-    1.84  0.170 / 0.310
G28     259.4          45.8               14.8 +/-    1.96      19.7 +/-    1.96  0.130 / 0.300
G30     321.1          51.3               12.7 +/-    0.77      15.8 +/-    0.77  0.170 / 0.400