PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/31-22:27:50
G03     239.0          68.3                7.9 +/-    0.78       8.4 +/-    0.78  0.030 / 0.040
G09     302.8          17.0                7.3 +/-    1.66      17.4 +/-    1.66  0.030 / 0.040
G14     99.3           14.9                8.8 +/-    1.83      21.9 +/-    1.83  0.030 / 0.040
G16     133.7          58.0               11.1 +/-    0.56      12.9 +/-    0.56  0.030 / 0.050
G22     196.0          56.5                9.2 +/-    0.39      10.8 +/-    0.39  0.160 / 0.160
G23     318.5          48.3                7.5 +/-    0.67       9.7 +/-    0.67  0.150 / 0.220
G26     71.7           52.9                7.1 +/-    0.82       8.6 +/-    0.82  0.200 / 0.240
G31     51.5           21.2                7.0 +/-    2.45      15.0 +/-    2.45  0.220 / 0.230