PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/30-05:12:40
G01     65.3           32.0                4.6 +/-    1.27       7.7 +/-    1.27  0.050 / 0.100
G07     140.0          26.4                6.1 +/-    1.61      11.6 +/-    1.61  0.090 / 0.080
G11     51.4           27.9                3.1 +/-    1.38       5.7 +/-    1.38  0.190 / 0.150
G13     269.8          36.3                6.8 +/-    1.17      10.5 +/-    1.17  0.130 / 0.150
G15     297.7          16.5                4.7 +/-    1.19      11.4 +/-    1.19  0.140 / 0.220
G17     244.9          73.5                6.5 +/-    0.45       6.7 +/-    0.45  0.100 / 0.170
G19     228.4          47.6                6.8 +/-    2.12       8.8 +/-    2.12  0.020 / 0.020
G28     29.1           57.7                4.7 +/-    1.31       5.5 +/-    1.31  0.020 / 0.020
G30     139.4          54.7                6.8 +/-    1.06       8.1 +/-    1.06  0.050 / 0.080