PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/18-18:27:30
G05     47.7           21.4                9.4 +/-    0.66      20.0 +/-    0.66  0.050 / 0.150
G13     80.8           37.4               11.7 +/-    1.35      17.8 +/-    1.35  0.060 / 0.160
G15     127.0          50.5               14.4 +/-    0.46      18.0 +/-    0.46  0.040 / 0.040
G18     243.4          40.9               11.4 +/-    1.19      16.4 +/-    1.19  0.040 / 0.050
G20     24.2           69.5               12.7 +/-    0.57      13.5 +/-    0.57  0.050 / 0.080
G21     312.5          47.5               10.9 +/-    0.80      14.2 +/-    0.80  0.050 / 0.070
G25     199.2          11.7               12.1 +/-    2.37      32.5 +/-    2.37  0.080 / 0.190
G26     295.1          18.6                9.6 +/-    1.69      21.9 +/-    1.69  0.090 / 0.210
G29     150.1          69.0               14.3 +/-    1.36      15.2 +/-    1.36  0.050 / 0.110