PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-01:57:20
G02     33.9           54.3                7.9 +/-    1.00       9.4 +/-    1.00  0.060 / 0.060
G05     136.1          62.6               10.2 +/-    0.36      11.4 +/-    0.36  0.040 / 0.050
G06     52.6           18.3                6.6 +/-    2.14      15.1 +/-    2.14  0.020 / 0.040
G12     204.9          69.8               10.9 +/-    0.60      11.5 +/-    0.60  0.030 / 0.030
G25     295.8          54.3                8.6 +/-    1.55      10.3 +/-    1.55  0.020 / 0.040
G29     309.5          31.8                8.5 +/-    1.42      14.3 +/-    1.42  0.030 / 0.040