PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-23:12:30
G03     240.3          68.3                7.8 +/-    0.42       8.3 +/-    0.42  0.040 / 0.040
G09     302.9          17.2                5.8 +/-    2.04      13.6 +/-    2.04  0.040 / 0.040
G14     99.4           14.7                7.6 +/-    2.71      19.0 +/-    2.71  0.190 / 0.300
G16     134.9          57.9                9.0 +/-    0.71      10.5 +/-    0.71  0.150 / 0.170
G22     196.3          56.7                8.3 +/-    0.56       9.7 +/-    0.56  0.030 / 0.040
G23     318.3          48.0                5.6 +/-    0.54       7.3 +/-    0.54  0.030 / 0.050
G26     72.3           53.3                5.5 +/-    0.62       6.7 +/-    0.62  0.170 / 0.350
G31     51.3           21.6                5.5 +/-    2.24      11.7 +/-    2.24  0.120 / 0.420