PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-16:28:10
G07     344.3          61.8               15.0 +/-    0.66      16.8 +/-    0.66  0.030 / 0.050
G08     89.1           53.6               15.0 +/-    0.43      18.2 +/-    0.43  0.040 / 0.050
G09     184.4          65.4               16.4 +/-    1.16      17.8 +/-    1.16  0.040 / 0.050
G11     141.5          17.8               14.6 +/-    1.07      33.9 +/-    1.07  0.030 / 0.050
G23     156.3          29.6               15.2 +/-    2.11      26.8 +/-    2.11  0.070 / 0.110
G27     48.4           27.0               11.8 +/-    1.14      22.1 +/-    1.14  0.070 / 0.110
G28     244.0          35.7               16.4 +/-    1.96      25.6 +/-    1.96  0.070 / 0.260
G30     308.7          40.9               13.7 +/-    1.23      19.7 +/-    1.23  0.090 / 0.240