PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/17-23:12:30
G03     257.8          69.9                8.3 +/-    0.83       8.8 +/-    0.83  0.030 / 0.030
G09     299.6          13.3                3.3 +/-   18.96       8.5 +/-   18.96  0.030 / 0.040
G14     95.0           18.1                8.4 +/-    1.61      19.3 +/-    1.61  0.040 / 0.040
G16     142.6          52.8               12.1 +/-    0.39      14.7 +/-    0.39  0.040 / 0.050
G22     201.6          62.4                9.2 +/-    0.54      10.2 +/-    0.54  0.120 / 0.130
G23     314.1          43.7                7.2 +/-    0.72       9.9 +/-    0.72  0.130 / 0.170
G26     82.3           55.0                8.4 +/-    1.04      10.0 +/-    1.04  0.100 / 0.220
G31     48.6           26.1                6.5 +/-    2.54      12.4 +/-    2.54  0.110 / 0.240