PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-21:12:20
G02     29.3           58.7                9.3 +/-    1.10      10.7 +/-    1.10  0.030 / 0.050
G05     146.2          60.8               11.7 +/-    0.40      13.2 +/-    0.40  0.040 / 0.040
G06     54.3           15.4                7.4 +/-    2.64      18.4 +/-    2.64  0.040 / 0.050
G12     196.6          66.6               10.2 +/-    0.35      11.0 +/-    0.35  0.040 / 0.050
G20     197.6          27.7               12.7 +/-    1.78      23.4 +/-    1.78  0.040 / 0.030
G25     291.1          57.6               10.6 +/-    2.07      12.3 +/-    2.07  0.040 / 0.030
G29     308.2          29.4                9.4 +/-    1.36      16.6 +/-    1.36  0.080 / 0.150