PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-17:43:10
G02     40.7           49.2               10.0 +/-    1.18      12.7 +/-    1.18  0.040 / 0.040
G05     131.0          67.9               12.2 +/-    0.46      13.1 +/-    0.46  0.040 / 0.040
G06     58.8           10.3                9.7 +/-    1.38      27.0 +/-    1.38  0.040 / 0.040
G12     192.6          57.9               13.5 +/-    0.62      15.6 +/-    0.62  0.040 / 0.040
G20     199.7          35.8               13.1 +/-    1.57      20.4 +/-    1.57  0.030 / 0.050
G25     276.1          59.4               10.8 +/-    2.11      12.4 +/-    2.11  0.030 / 0.050
G29     315.7          38.5               10.0 +/-    0.99      14.9 +/-    0.99  0.030 / 0.030