PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-17:57:30
G02     46.0           44.6               11.4 +/-    0.91      15.5 +/-    0.91  0.030 / 0.040
G05     112.2          70.9               12.8 +/-    0.65      13.5 +/-    0.65  0.030 / 0.040
G12     189.8          50.8               13.0 +/-    1.06      16.2 +/-    1.06  0.040 / 0.040
G20     201.1          42.4               13.7 +/-    1.00      19.2 +/-    1.00  0.040 / 0.050
G25     262.2          59.5               13.4 +/-    1.20      15.3 +/-    1.20  0.100 / 0.060
G29     320.1          43.6                9.7 +/-    0.70      13.3 +/-    0.70  0.070 / 0.060