PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/12-18:28:00
G07     27.2           67.8               10.9 +/-    0.53      11.7 +/-    0.53  0.030 / 0.030
G08     65.1           48.4               11.3 +/-    1.73      14.5 +/-    1.73  0.030 / 0.030
G09     181.2          53.3               13.8 +/-    0.55      16.8 +/-    0.55  0.290 / 0.200
G11     130.6          27.0               10.4 +/-    1.81      19.5 +/-    1.81  0.200 / 0.300
G23     160.0          22.0               13.0 +/-    1.83      27.2 +/-    1.83  0.050 / 0.040
G27     42.2           20.3                9.4 +/-    2.70      20.6 +/-    2.70  0.050 / 0.050
G28     253.4          40.2               13.7 +/-    2.10      19.9 +/-    2.10  0.110 / 0.170
G30     319.3          50.2               10.6 +/-    0.53      13.3 +/-    0.53  0.120 / 0.220