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               12.5 +/-    1.47      21.9 +/-    1.47  0.050 / 0.080
G05     50.5           56.1               12.2 +/-    0.40      14.3 +/-    0.40  0.050 / 0.070
G12     182.4          22.0               19.9 +/-    1.05      41.7 +/-    1.05  0.020 / 0.040
G13     122.4          21.2               18.8 +/-    1.04      40.1 +/-    1.04  0.030 / 0.050
G15     161.2          17.6               22.7 +/-    2.86      53.0 +/-    2.86  0.080 / 0.230
G20     212.9          71.8               17.1 +/-    0.51      17.9 +/-    0.51  0.070 / 0.220
G21     278.0          22.5               14.8 +/-    2.17      30.7 +/-    2.17  0.070 / 0.120
G25     219.6          43.1               16.9 +/-    0.96      23.4 +/-    0.96  0.070 / 0.100
G29     335.6          64.9               14.2 +/-    0.41      15.5 +/-    0.41  0.030 / 0.050