PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-18:27:50
G01     102.4          27.9               16.5 +/-    1.10      30.3 +/-    1.10  0.030 / 0.060
G07     113.3          55.1               16.4 +/-    0.35      19.5 +/-    0.35  0.030 / 0.070
G08     41.9           18.5               11.5 +/-    1.11      26.2 +/-    1.11  0.070 / 0.160
G11     83.7           43.0               16.3 +/-    0.33      22.6 +/-    0.33  0.070 / 0.150
G13     305.9          31.2               13.4 +/-    0.91      22.9 +/-    0.91  0.030 / 0.060
G17     208.7          39.6               16.7 +/-    1.53      24.5 +/-    1.53  0.030 / 0.050
G18     75.7           24.8               15.0 +/-    0.99      29.5 +/-    0.99  0.040 / 0.070
G28     327.6          61.6               13.5 +/-    0.81      15.1 +/-    0.81  0.040 / 0.080
G30     52.4           79.5               15.4 +/-    0.58      15.6 +/-    0.58  0.030 / 0.040