PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-22:58:10
G02     206.0          44.1               16.7 +/-    2.12      22.8 +/-    2.12  0.060 / 0.150
G06     151.0          75.7               13.2 +/-    1.08      13.6 +/-    1.08  0.070 / 0.170
G12     310.7          19.5               10.8 +/-    1.19      24.0 +/-    1.19  0.050 / 0.070
G17     43.9           42.4               11.1 +/-    0.39      15.6 +/-    0.39  0.060 / 0.080
G19     17.2           59.8               12.1 +/-    0.78      13.8 +/-    0.78  0.090 / 0.210
G24     286.2          41.8               12.7 +/-    1.20      17.9 +/-    1.20  0.110 / 0.260
G28     108.2          29.3               14.6 +/-    0.99      26.0 +/-    0.99  0.030 / 0.040