PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-19:12:50
G07     32.8           69.6               12.5 +/-    0.68      13.2 +/-    0.68  0.200 / 0.330
G08     58.6           47.3               11.5 +/-    0.94      15.0 +/-    0.94  0.160 / 0.310
G09     179.5          43.1               14.0 +/-    0.80      19.5 +/-    0.80  0.040 / 0.050
G11     126.2          31.3               14.5 +/-    1.38      24.8 +/-    1.38  0.040 / 0.050
G18     109.7          13.6               13.5 +/-    1.95      34.8 +/-    1.95  0.030 / 0.040
G27     38.1           11.5                9.6 +/-    2.29      26.0 +/-    2.29  0.030 / 0.030
G28     268.0          49.9               12.8 +/-    3.35      16.2 +/-    3.35  0.140 / 0.110
G30     328.6          57.1               11.2 +/-    0.26      13.1 +/-    0.26  0.110 / 0.110