PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/19-17:27:40
G07     353.9          63.8               11.9 +/-    0.65      13.1 +/-    0.65  0.030 / 0.030
G08     88.6           52.1               11.8 +/-    1.24      14.5 +/-    1.24  0.050 / 0.040
G09     188.0          69.2               13.0 +/-    0.27      13.8 +/-    0.27  0.070 / 0.100
G11     141.2          17.5               12.7 +/-    2.76      29.7 +/-    2.76  0.080 / 0.090
G23     157.2          36.3               13.1 +/-    1.35      20.3 +/-    1.35  0.070 / 0.100
G27     51.7           30.1               11.4 +/-    1.08      19.9 +/-    1.08  0.140 / 0.100
G28     239.9          29.4               13.9 +/-    1.60      24.5 +/-    1.60  0.040 / 0.030
G30     307.1          40.1               11.8 +/-    1.12      17.2 +/-    1.12  0.030 / 0.040