PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-04:28:00
G08     287.5          23.5                8.4 +/-    1.43      17.0 +/-    1.43  0.030 / 0.030
G10     13.6           63.3                8.0 +/-    0.37       8.9 +/-    0.37  0.030 / 0.020
G14     234.3          51.7                8.7 +/-    2.21      10.8 +/-    2.21  0.060 / 0.090
G18     66.3           50.7                5.8 +/-    1.62       7.3 +/-    1.62  0.060 / 0.080
G21     147.9          36.7                8.3 +/-    1.16      12.8 +/-    1.16  0.200 / 0.110
G24     53.8           24.9                6.7 +/-    2.94      13.2 +/-    2.94  0.210 / 0.200
G27     248.6          29.2                9.2 +/-    1.12      16.4 +/-    1.12  0.030 / 0.020
G32     254.7          70.1                7.5 +/-    0.66       8.0 +/-    0.66  0.030 / 0.030