PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/15-21:13:00
G02     60.7           32.8                9.3 +/-    0.68      15.4 +/-    0.68  0.040 / 0.070
G05     58.0           63.3               12.1 +/-    0.87      13.4 +/-    0.87  0.050 / 0.060
G12     184.2          28.9               13.8 +/-    1.29      24.8 +/-    1.29  0.090 / 0.260
G13     127.6          17.1               14.9 +/-    1.97      35.3 +/-    1.97  0.140 / 0.280
G15     163.4          13.4               16.8 +/-    2.98      43.6 +/-    2.98  0.050 / 0.090
G20     208.5          64.6               15.3 +/-    0.80      16.8 +/-    0.80  0.050 / 0.120
G21     273.4          19.3               10.7 +/-    1.47      23.9 +/-    1.47  0.030 / 0.050
G25     225.6          48.4               13.8 +/-    0.98      17.7 +/-    0.98  0.030 / 0.050
G29     332.3          59.8               12.0 +/-    0.78      13.7 +/-    0.78  0.040 / 0.040