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                9.1 +/-    2.31      18.4 +/-    2.31  0.040 / 0.040
G10     13.6           63.3                4.8 +/-    0.99       5.4 +/-    0.99  0.040 / 0.030
G14     234.3          51.7                2.9 +/-    2.76       3.6 +/-    2.76  0.110 / 0.170
G18     66.3           50.7              -88.3 +/-   31.23    -110.4 +/-   31.23  0.160 / 0.160
G21     147.9          36.7                9.6 +/-    1.37      14.8 +/-    1.37  0.060 / 0.120
G24     53.8           24.9                7.0 +/-    1.76      13.7 +/-    1.76  0.060 / 0.150
G27     248.6          29.2                8.4 +/-    1.80      15.0 +/-    1.80  0.030 / 0.030
G31     182.8          10.0               -7.7 +/-   10.46     -21.4 +/-   10.46  0.030 / 0.030
G32     254.7          70.1                7.7 +/-    1.51       8.1 +/-    1.51  0.080 / 0.110