PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-19:57:30
G02     38.9           51.0               11.9 +/-    0.86      14.8 +/-    0.86  0.040 / 0.040
G05     133.5          67.4               13.4 +/-    0.39      14.4 +/-    0.39  0.040 / 0.040
G06     58.9           9.7                 9.7 +/-    1.43      27.1 +/-    1.43  0.040 / 0.040
G12     191.6          57.6               13.2 +/-    0.47      15.3 +/-    0.47  0.040 / 0.040
G20     199.2          36.1               13.8 +/-    1.22      21.4 +/-    1.22  0.030 / 0.030
G25     274.3          60.2               13.0 +/-    1.07      14.7 +/-    1.07  0.030 / 0.030
G29     314.6          36.8               12.1 +/-    1.07      18.5 +/-    1.07  0.060 / 0.080