PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-22:27:50
G07     347.2          62.5               10.5 +/-    0.84      11.7 +/-    0.84  0.080 / 0.120
G08     86.7           53.7               10.6 +/-    0.46      12.8 +/-    0.46  0.070 / 0.100
G09     185.5          64.8               11.8 +/-    0.32      12.9 +/-    0.32  0.060 / 0.090
G11     142.3          18.0               12.9 +/-    2.74      29.9 +/-    2.74  0.060 / 0.090
G23     157.5          30.7               11.2 +/-    0.90      19.3 +/-    0.90  0.040 / 0.040
G27     47.0           25.7               10.2 +/-    0.96      19.7 +/-    0.96  0.040 / 0.050
G28     245.6          37.2               12.1 +/-    1.06      18.4 +/-    1.06  0.120 / 0.320
G30     312.4          44.8                8.2 +/-    1.14      11.0 +/-    1.14  0.120 / 0.410