PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-19:27:50
G01     317.9          20.2               10.5 +/-    2.38      23.1 +/-    2.38  0.220 / 0.370
G08     255.1          11.7               12.0 +/-    1.78      32.2 +/-    1.78  0.140 / 0.290
G10     83.7           52.2               11.2 +/-    0.68      13.8 +/-    0.68  0.210 / 0.270
G11     301.1          24.0               10.5 +/-    1.27      21.0 +/-    1.27  0.150 / 0.290
G14     306.7          71.0                9.8 +/-    1.17      10.3 +/-    1.17  0.040 / 0.070
G18     104.9          25.5               14.3 +/-    0.76      27.7 +/-    0.76  0.050 / 0.080
G22     301.9          12.1               10.9 +/-    2.57      29.0 +/-    2.57  0.040 / 0.030
G31     176.9          43.9               12.7 +/-    1.18      17.3 +/-    1.18  0.040 / 0.040
G32     11.0           65.9                9.4 +/-    0.57      10.2 +/-    0.57  0.070 / 0.050