PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-03:12:30
G07     3.0            66.0                3.9 +/-    0.72       4.2 +/-    0.72  0.060 / 0.110
G08     71.3           50.6                5.3 +/-    0.42       6.6 +/-    0.42  0.050 / 0.090
G09     181.7          56.6                6.8 +/-    0.61       8.0 +/-    0.61  0.040 / 0.040
G11     135.2          23.0                8.2 +/-    1.03      16.8 +/-    1.03  0.040 / 0.040
G23     159.6          25.8                6.9 +/-    1.24      13.3 +/-    1.24  0.040 / 0.050
G27     42.8           20.6                3.1 +/-    0.98       6.8 +/-    0.98  0.040 / 0.050
G28     252.9          42.3                4.8 +/-    0.62       6.8 +/-    0.62  0.080 / 0.110
G30     316.7          47.7                1.4 +/-    0.56       1.9 +/-    0.56  0.070 / 0.120