PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/18-21:28:10
G07     345.2          62.0               12.3 +/-    0.48      13.8 +/-    0.48  0.040 / 0.040
G08     90.1           51.5               13.3 +/-    0.66      16.4 +/-    0.66  0.030 / 0.030
G09     187.5          70.6               14.6 +/-    0.68      15.4 +/-    0.68  0.030 / 0.020
G11     142.2          16.1               16.7 +/-    2.91      40.5 +/-    2.91  0.030 / 0.020
G23     157.2          40.2               14.8 +/-    0.69      21.5 +/-    0.69  0.150 / 0.060
G27     54.2           31.9               10.3 +/-    1.62      17.3 +/-    1.62  0.090 / 0.060
G28     238.6          28.8               14.7 +/-    1.53      26.5 +/-    1.53  0.110 / 0.150
G30     304.2          37.0               12.3 +/-    1.96      18.9 +/-    1.96  0.070 / 0.150