PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/19-16:57:50
G07     329.7          57.5               12.9 +/-    1.20      15.0 +/-    1.20  0.030 / 0.050
G08     111.6          48.3               13.5 +/-    0.37      17.4 +/-    0.37  0.030 / 0.040
G09     229.0          81.9               12.8 +/-    0.54      12.9 +/-    0.54  0.040 / 0.060
G16     44.0           17.1               10.4 +/-    2.74      24.7 +/-    2.74  0.040 / 0.060
G23     152.1          51.0               13.8 +/-    0.45      17.2 +/-    0.45  0.060 / 0.070
G27     66.1           36.3               13.2 +/-    0.79      20.4 +/-    0.79  0.070 / 0.080
G28     230.1          18.4               13.6 +/-    1.10      31.2 +/-    1.10  0.040 / 0.030
G30     295.9          31.0               12.9 +/-    0.50      22.2 +/-    0.50  0.030 / 0.030