PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-16:57:40
G02     17.7           67.1                8.6 +/-    0.66       9.3 +/-    0.66  0.090 / 0.460
G05     160.7          46.8               12.1 +/-    1.02      15.9 +/-    1.02  0.120 / 0.320
G06     47.1           27.4                8.3 +/-    1.08      15.4 +/-    1.08  0.020 / 0.040
G12     243.0          79.0                8.7 +/-    0.79       8.8 +/-    0.79  0.020 / 0.040
G19     90.2           16.2               11.8 +/-    2.03      28.5 +/-    2.03  0.050 / 0.080
G20     197.5          13.9               10.5 +/-    4.95      26.8 +/-    4.95  0.060 / 0.080
G24     218.4          12.3                9.3 +/-    2.76      24.6 +/-    2.76  0.150 / 0.670
G25     309.7          46.2               10.1 +/-    1.74      13.4 +/-    1.74  0.220 / 0.510
G29     299.6          22.0                8.8 +/-    1.49      18.5 +/-    1.49  0.030 / 0.050