PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-01:57:50
G02     33.9           54.3                7.9 +/-    0.48       9.5 +/-    0.48  0.040 / 0.060
G05     136.1          62.6               10.8 +/-    0.68      12.0 +/-    0.68  0.050 / 0.070
G06     52.6           18.3                6.3 +/-    0.75      14.5 +/-    0.75  0.030 / 0.030
G12     204.9          69.8                9.5 +/-    0.50      10.1 +/-    0.50  0.020 / 0.040
G25     295.8          54.3                7.8 +/-    0.77       9.4 +/-    0.77  0.040 / 0.040
G29     309.5          31.8                7.5 +/-    1.49      12.7 +/-    1.49  0.030 / 0.040