PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-15:28:00
G02     35.0           54.2               11.7 +/-    0.66      14.1 +/-    0.66  0.030 / 0.050
G05     143.0          62.2               15.7 +/-    1.07      17.5 +/-    1.07  0.030 / 0.040
G06     54.0           17.0                7.9 +/-    0.70      18.7 +/-    0.70  0.030 / 0.050
G12     200.3          67.0               10.0 +/-    0.67      10.8 +/-    0.67  0.020 / 0.050
G20     198.8          27.1               12.4 +/-    2.28      23.1 +/-    2.28  0.050 / 0.050
G25     292.9          55.8               11.8 +/-    1.21      13.9 +/-    1.21  0.040 / 0.060
G29     311.1          33.8                9.4 +/-    0.69      15.2 +/-    0.69  0.120 / 0.200