PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-18:57:50
G07     29.2           69.4               13.4 +/-    0.53      14.2 +/-    0.53  0.130 / 0.340
G08     59.9           48.0               12.7 +/-    0.79      16.5 +/-    0.79  0.170 / 0.260
G09     179.6          44.3               14.7 +/-    0.65      20.0 +/-    0.65  0.040 / 0.050
G11     127.2          30.5               15.3 +/-    1.92      26.5 +/-    1.92  0.050 / 0.050
G18     110.7          12.9               14.2 +/-    2.35      37.0 +/-    2.35  0.280 / 0.510
G23     158.8          10.3               14.0 +/-    4.63      38.8 +/-    4.63  0.170 / 0.520
G27     38.5           12.5               10.5 +/-    1.97      27.8 +/-    1.97  0.030 / 0.040
G28     266.2          49.1               14.1 +/-    4.65      17.9 +/-    4.65  0.030 / 0.030
G30     327.2          56.1               12.7 +/-    0.63      15.0 +/-    0.63  0.030 / 0.030