PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-09:28:10
G02     243.2          77.7                3.3 +/-    0.41       3.3 +/-    0.41  0.230 / 0.260
G05     172.0          16.0                2.5 +/-    2.14       6.0 +/-    2.14  0.160 / 0.260
G06     39.6           64.8                1.5 +/-    0.61       1.7 +/-    0.61  0.100 / 0.110
G12     321.2          50.3                2.6 +/-    0.24       3.3 +/-    0.24  0.090 / 0.100
G17     71.7           21.6                4.1 +/-    0.78       8.8 +/-    0.78  0.030 / 0.040
G19     58.3           37.6                3.4 +/-    0.75       5.1 +/-    0.75  0.030 / 0.040
G24     246.8          35.0                5.0 +/-    2.05       7.9 +/-    2.05  0.030 / 0.020
G25     316.8          12.5                0.5 +/-   14.03       1.2 +/-   14.03  0.030 / 0.030