PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-19:57:50
G02     38.9           51.0               12.8 +/-    0.51      16.0 +/-    0.51  0.030 / 0.050
G05     133.5          67.4               14.3 +/-    0.80      15.4 +/-    0.80  0.030 / 0.050
G12     191.6          57.6               13.1 +/-    0.78      15.2 +/-    0.78  0.040 / 0.040
G20     199.2          36.1               15.3 +/-    0.73      23.8 +/-    0.73  0.040 / 0.050
G25     274.3          60.2               12.5 +/-    1.31      14.2 +/-    1.31  0.050 / 0.110
G29     314.6          36.8               12.8 +/-    1.41      19.6 +/-    1.41  0.030 / 0.090