PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-20:12:40
G05     46.8           24.9               11.6 +/-    1.64      22.6 +/-    1.64  0.090 / 0.240
G13     84.3           37.3               13.3 +/-    0.58      20.2 +/-    0.58  0.080 / 0.230
G15     131.5          48.6               14.2 +/-    1.11      18.3 +/-    1.11  0.040 / 0.090
G18     241.0          38.3               14.1 +/-    1.14      21.0 +/-    1.14  0.040 / 0.100
G20     23.0           71.1               13.6 +/-    0.80      14.3 +/-    0.80  0.110 / 0.460
G21     309.2          45.0               12.5 +/-    1.40      16.8 +/-    1.40  0.100 / 0.500
G25     199.7          13.1               15.8 +/-    3.93      41.1 +/-    3.93  0.040 / 0.120
G26     296.3          19.1               11.9 +/-    0.95      26.7 +/-    0.95  0.050 / 0.130
G29     148.2          73.3               14.2 +/-    0.61      14.7 +/-    0.61  0.050 / 0.050