PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/26-19:27:20
G02     234.9          70.7                9.0 +/-    0.72       9.5 +/-    0.72  0.030 / 0.030
G05     174.6          13.1               15.5 +/-    3.29      40.3 +/-    3.29  0.030 / 0.030
G06     41.3           59.0                9.7 +/-    0.36      11.1 +/-    0.36  0.030 / 0.040
G12     322.0          52.5                9.7 +/-    1.15      11.9 +/-    1.15  0.040 / 0.040
G17     71.9           20.5                9.2 +/-    1.64      20.0 +/-    1.64  0.150 / 0.200
G19     58.2           37.4                8.3 +/-    1.15      12.7 +/-    1.15  0.620 / 0.310
G25     316.8          15.9                7.7 +/-    1.58      18.8 +/-    1.58  0.170 / 0.270