PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-21:27:50
G01     256.4          37.4               10.3 +/-    1.95      15.6 +/-    1.95  0.030 / 0.050
G03     316.4          39.7                7.6 +/-    0.92      11.2 +/-    0.92  0.040 / 0.040
G11     241.6          15.2               11.3 +/-    1.85      27.9 +/-    1.85  0.020 / 0.030
G14     55.7           43.4                8.9 +/-    1.38      12.2 +/-    1.38  0.030 / 0.030
G22     309.4          61.5                8.0 +/-    1.06       9.0 +/-    1.06  0.100 / 0.160
G23     283.1          16.2                4.1 +/-   11.72      10.0 +/-   11.72  0.080 / 0.110
G25     42.9           12.4                7.2 +/-    3.82      19.1 +/-    3.82  0.080 / 0.090
G26     141.9          33.6               11.6 +/-    1.58      18.8 +/-    1.58  0.060 / 0.080
G31     42.2           64.9                8.2 +/-    0.61       8.9 +/-    0.61  0.050 / 0.100
G32     73.3           26.3                8.3 +/-    1.10      15.7 +/-    1.10  0.050 / 0.090