PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-16:43:10
G07     355.8          64.2               12.2 +/-    0.95      13.4 +/-    0.95  0.080 / 0.130
G08     88.3           52.3               11.3 +/-    0.96      13.9 +/-    0.96  0.130 / 0.190
G09     187.8          68.8               12.1 +/-    0.60      12.9 +/-    0.60  0.030 / 0.040
G11     141.0          17.8               12.3 +/-    1.14      28.6 +/-    1.14  0.050 / 0.040
G23     157.1          35.5               11.5 +/-    1.15      18.2 +/-    1.15  0.120 / 0.100
G27     51.3           29.7               11.5 +/-    0.87      20.2 +/-    0.87  0.080 / 0.090
G28     240.3          29.6               14.5 +/-    1.51      25.7 +/-    1.51  0.070 / 0.080
G30     307.8          40.8               11.3 +/-    1.07      16.3 +/-    1.07  0.110 / 0.080