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               11.2 +/-    0.47      13.9 +/-    0.47  0.040 / 0.050
G05     136.6          66.2               12.5 +/-    0.54      13.5 +/-    0.54  0.040 / 0.040
G06     57.5           11.9               10.2 +/-    2.40      27.2 +/-    2.40  0.040 / 0.060
G12     194.0          60.4               12.2 +/-    0.99      13.8 +/-    0.99  0.040 / 0.050
G20     199.2          33.5               14.0 +/-    1.03      22.9 +/-    1.03  0.080 / 0.170
G25     280.9          58.9               12.2 +/-    0.40      14.0 +/-    0.40  0.060 / 0.140
G29     314.1          36.6               10.8 +/-    1.07      16.7 +/-    1.07  0.030 / 0.040