PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-18:42:50
G05     51.4           12.9               11.9 +/-    1.45      31.1 +/-    1.45  0.070 / 0.140
G10     241.5          17.4               12.5 +/-    1.61      29.3 +/-    1.61  0.090 / 0.130
G13     67.4           36.1               14.0 +/-    0.80      21.7 +/-    0.80  0.140 / 0.250
G15     109.3          56.1               15.8 +/-    0.39      18.6 +/-    0.39  0.130 / 0.210
G16     311.6          11.9                9.6 +/-    1.17      25.8 +/-    1.17  0.160 / 0.440
G18     254.2          48.9               14.8 +/-    0.64      18.9 +/-    0.64  0.160 / 0.470
G20     33.5           59.6               14.5 +/-    0.34      16.5 +/-    0.34  0.040 / 0.050
G21     323.2          54.3               13.8 +/-    0.90      16.6 +/-    0.90  0.040 / 0.040
G26     284.7          18.0               10.8 +/-    1.29      24.9 +/-    1.29  0.060 / 0.070
G29     157.4          57.1               16.4 +/-    0.63      19.1 +/-    0.63  0.040 / 0.060