PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-15:42:50
G02     247.4          77.0                8.9 +/-    0.45       9.1 +/-    0.45  0.270 / 0.340
G05     174.0          15.7                8.5 +/-    2.06      20.7 +/-    2.06  0.280 / 0.250
G06     40.1           57.0                7.6 +/-    0.65       8.8 +/-    0.65  0.030 / 0.030
G12     321.4          54.3                9.0 +/-    0.98      10.8 +/-    0.98  0.040 / 0.040
G17     74.7           18.5                8.0 +/-    1.79      18.3 +/-    1.79  0.030 / 0.030
G19     61.5           35.3                8.0 +/-    0.62      12.5 +/-    0.62  0.030 / 0.030
G24     244.5          33.6                9.9 +/-    2.42      16.2 +/-    2.42  0.110 / 0.200
G25     317.3          17.3                8.8 +/-    2.19      20.6 +/-    2.19  0.120 / 0.230