PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-17:27:40
G02     37.7           51.8               12.4 +/-    1.03      15.3 +/-    1.03  0.050 / 0.050
G05     138.7          65.3               14.7 +/-    0.35      16.0 +/-    0.35  0.040 / 0.050
G06     56.8           12.9                8.9 +/-    1.81      23.2 +/-    1.81  0.030 / 0.030
G12     195.0          61.9               14.4 +/-    0.71      16.1 +/-    0.71  0.030 / 0.040
G20     199.1          32.2               13.8 +/-    1.39      23.1 +/-    1.39  0.120 / 0.160
G25     283.6          58.4               12.5 +/-    0.66      14.4 +/-    0.66  0.080 / 0.150
G29     313.3          35.8               11.0 +/-    0.96      17.1 +/-    0.96  0.020 / 0.030