PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-16:12:30
G07     329.8          56.7               12.2 +/-    0.63      14.3 +/-    0.63  0.030 / 0.030
G08     105.6          51.8               13.1 +/-    0.41      16.1 +/-    0.41  0.040 / 0.030
G09     194.4          75.4               13.9 +/-    0.43      14.3 +/-    0.43  0.080 / 0.090
G11     147.5          11.9               13.9 +/-    4.06      37.1 +/-    4.06  0.100 / 0.090
G23     153.5          39.0               14.1 +/-    1.00      20.8 +/-    1.00  0.080 / 0.180
G27     56.4           32.3               10.6 +/-    1.43      17.7 +/-    1.43  0.060 / 0.170
G28     236.2          28.5               13.9 +/-    1.96      25.1 +/-    1.96  0.030 / 0.040
G30     301.1          34.7               10.2 +/-    1.10      16.2 +/-    1.10  0.030 / 0.040