PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-20:12:40
G01     304.5          34.8                9.8 +/-    1.39      15.7 +/-    1.39  0.060 / 0.160
G10     108.8          38.6               13.7 +/-    0.55      20.3 +/-    0.55  0.070 / 0.100
G11     279.5          28.1               11.0 +/-    1.09      20.1 +/-    1.09  0.020 / 0.030
G14     3.2            65.5                8.9 +/-    0.50       9.7 +/-    0.50  0.030 / 0.030
G18     119.4          10.7               13.9 +/-    2.22      38.2 +/-    2.22  0.110 / 0.120
G22     310.5          27.6               10.2 +/-    2.73      18.7 +/-    2.73  0.110 / 0.110
G25     79.1           17.3               11.8 +/-    2.49      27.8 +/-    2.49  0.030 / 0.030
G31     167.5          66.9               10.9 +/-    0.41      11.7 +/-    0.41  0.030 / 0.040
G32     38.3           51.1                9.3 +/-    1.75      11.5 +/-    1.75  0.030 / 0.040