PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-02:28:30
G02     45.6           43.9                5.7 +/-    0.75       7.9 +/-    0.75  0.040 / 0.050
G05     99.3           68.9                9.0 +/-    0.72       9.5 +/-    0.72  0.030 / 0.050
G12     191.9          54.6               10.8 +/-    1.67      12.9 +/-    1.67  0.040 / 0.050
G25     269.3          58.9                7.9 +/-    1.05       9.1 +/-    1.05  0.030 / 0.050
G29     319.5          42.7                8.1 +/-    1.14      11.3 +/-    1.14  0.020 / 0.030