PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-16:58:00
G03     187.5          15.3               13.1 +/-    4.22      32.2 +/-    4.22  0.090 / 0.110
G07     294.7          39.7               13.7 +/-    3.34      20.1 +/-    3.34  0.050 / 0.090
G08     142.0          30.6               17.4 +/-    1.17      30.1 +/-    1.17  0.070 / 0.110
G09     318.8          67.1               13.9 +/-    0.76      15.0 +/-    0.76  0.070 / 0.100
G16     41.9           33.1               10.3 +/-    1.11      17.0 +/-    1.11  0.020 / 0.030
G23     130.2          70.0               14.8 +/-    0.84      15.6 +/-    0.84  0.030 / 0.040
G27     93.0           35.5               14.3 +/-    1.31      22.5 +/-    1.31  0.190 / 0.210
G30     278.0          16.8               12.5 +/-    2.18      29.7 +/-    2.18  0.350 / 0.260