PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-18:28:00
G07     58.6           67.1               10.8 +/-    0.35      11.6 +/-    0.35  0.030 / 0.040
G08     52.8           41.5               10.4 +/-    0.52      14.7 +/-    0.52  0.030 / 0.040
G09     179.3          41.1               14.4 +/-    1.42      20.6 +/-    1.42  0.020 / 0.040
G11     120.5          34.1               13.0 +/-    0.62      21.0 +/-    0.62  0.040 / 0.040
G17     198.9          12.0               14.1 +/-    3.71      37.7 +/-    3.71  0.070 / 0.090
G18     104.6          14.9               11.9 +/-    1.38      29.7 +/-    1.38  0.050 / 0.090
G23     160.6          11.0               13.1 +/-    7.40      35.8 +/-    7.40  0.180 / 0.320
G27     38.1           11.5                9.3 +/-    1.71      25.3 +/-    1.71  0.230 / 0.370
G28     266.6          47.4               14.2 +/-    1.46      18.5 +/-    1.46  0.090 / 0.310
G30     330.8          59.1               10.4 +/-    0.97      11.9 +/-    0.97  0.090 / 0.240