PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-22:27:50
G03     256.5          70.1               11.5 +/-    0.48      12.2 +/-    0.48  0.040 / 0.040
G09     299.6          13.2               10.9 +/-    2.91      28.3 +/-    2.91  0.030 / 0.030
G14     94.9           18.3               10.1 +/-    1.82      23.1 +/-    1.82  0.140 / 0.140
G16     141.6          53.1               12.5 +/-    0.38      15.2 +/-    0.38  0.120 / 0.150
G22     201.2          62.2               10.6 +/-    0.60      11.8 +/-    0.60  0.040 / 0.050
G23     314.2          43.9                9.9 +/-    0.92      13.5 +/-    0.92  0.040 / 0.040
G26     81.5           54.7               10.3 +/-    0.65      12.3 +/-    0.65  0.100 / 0.260
G31     48.8           25.6                8.9 +/-    2.41      17.2 +/-    2.41  0.110 / 0.240