PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/21-15:28:00
G02     36.6           52.8                8.5 +/-    0.49      10.3 +/-    0.49  0.030 / 0.040
G05     139.7          63.8               13.2 +/-    1.15      14.6 +/-    1.15  0.030 / 0.040
G06     55.0           15.7                7.4 +/-    0.99      18.2 +/-    0.99  0.040 / 0.040
G12     198.3          65.0               10.0 +/-    0.79      10.9 +/-    0.79  0.030 / 0.040
G20     199.1          28.9               12.6 +/-    1.38      22.5 +/-    1.38  0.110 / 0.330
G25     289.7          56.7                9.9 +/-    0.62      11.6 +/-    0.62  0.160 / 0.280
G29     312.5          35.3                9.3 +/-    2.15      14.8 +/-    2.15  0.100 / 0.170