PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-19:57:40
G02     249.9          75.6               15.9 +/-    1.32      16.4 +/-    1.32  0.080 / 0.260
G05     172.2          18.6               22.9 +/-    1.85      52.1 +/-    1.85  0.100 / 0.210
G06     40.3           52.7               13.7 +/-    0.59      16.8 +/-    0.59  0.070 / 0.250
G12     321.5          59.0               14.1 +/-    0.72      16.2 +/-    0.72  0.060 / 0.180
G17     76.9           16.9               12.4 +/-    0.66      29.4 +/-    0.66  0.090 / 0.110
G19     64.1           33.6               12.5 +/-    1.10      20.4 +/-    1.10  0.110 / 0.120
G24     241.9          32.2               17.5 +/-    1.35      29.2 +/-    1.35  0.030 / 0.030
G25     317.6          21.1               10.0 +/-    3.50      21.4 +/-    3.50  0.030 / 0.040