PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/07-18:57:40
G07     328.0          56.0               12.5 +/-    0.61      14.8 +/-    0.61  0.040 / 0.050
G08     111.9          51.5               13.3 +/-    0.61      16.5 +/-    0.61  0.040 / 0.050
G09     200.4          77.1               12.1 +/-    0.28      12.4 +/-    0.28  0.080 / 0.110
G11     149.3          10.8                9.8 +/-   27.01      26.8 +/-   27.01  0.080 / 0.100
G23     153.2          40.9               13.1 +/-    0.84      18.8 +/-    0.84  0.040 / 0.080
G27     57.4           32.7               10.3 +/-    1.45      17.2 +/-    1.45  0.040 / 0.070
G28     235.3          27.7               13.7 +/-    1.65      25.3 +/-    1.65  0.030 / 0.040
G30     301.0          35.0               11.9 +/-    1.95      18.8 +/-    1.95  0.040 / 0.050