PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-17:43:00
G02     38.7           51.0               10.1 +/-    1.05      12.6 +/-    1.05  0.040 / 0.050
G05     136.6          66.2               12.0 +/-    0.57      12.9 +/-    0.57  0.050 / 0.050
G06     57.5           11.9                9.3 +/-    1.76      24.9 +/-    1.76  0.030 / 0.040
G12     194.0          60.4               12.8 +/-    0.51      14.5 +/-    0.51  0.030 / 0.040
G20     199.2          33.5               12.3 +/-    1.49      20.0 +/-    1.49  0.180 / 0.160
G25     280.9          58.9               10.1 +/-    1.40      11.6 +/-    1.40  0.170 / 0.200
G29     314.1          36.6                9.8 +/-    0.81      15.0 +/-    0.81  0.030 / 0.030