PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-22:57:20
G02     205.8          43.6               15.2 +/-    1.15      21.0 +/-    1.15  0.060 / 0.060
G06     152.3          75.3               13.5 +/-    0.43      13.9 +/-    0.43  0.060 / 0.070
G12     310.5          19.1                9.4 +/-    2.61      21.2 +/-    2.61  0.080 / 0.130
G17     43.5           42.7               11.1 +/-    1.52      15.5 +/-    1.52  0.070 / 0.140
G19     16.5           60.1               12.0 +/-    1.19      13.6 +/-    1.19  0.120 / 0.150
G24     286.8          41.7               18.9 +/-    1.28      26.7 +/-    1.28  0.070 / 0.190
G28     107.8          29.6               14.2 +/-    1.10      25.0 +/-    1.10  0.040 / 0.040