PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-23:12:40
G02     64.9           30.1               12.1 +/-    1.30      21.2 +/-    1.30  0.050 / 0.080
G05     50.5           56.1               12.3 +/-    0.56      14.5 +/-    0.56  0.050 / 0.080
G12     182.4          22.0               19.1 +/-    2.93      40.0 +/-    2.93  0.320 / 0.260
G13     122.4          21.2               16.3 +/-    2.19      34.7 +/-    2.19  0.150 / 0.250
G15     161.2          17.6               20.8 +/-    1.61      48.6 +/-    1.61  0.100 / 0.130
G20     212.9          71.8               16.4 +/-    0.42      17.2 +/-    0.42  0.150 / 0.190
G21     278.0          22.5               14.7 +/-    2.06      30.4 +/-    2.06  0.080 / 0.070
G25     219.6          43.1               15.8 +/-    2.52      21.9 +/-    2.52  0.070 / 0.090
G29     335.6          64.9               13.8 +/-    0.98      15.1 +/-    0.98  0.040 / 0.030