PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/31-19:42:50
G01     228.0          18.5               14.3 +/-    1.21      32.6 +/-    1.21  0.040 / 0.080
G03     288.4          68.2               11.9 +/-    0.66      12.7 +/-    0.66  0.050 / 0.080
G14     84.4           26.3               13.5 +/-    1.28      25.5 +/-    1.28  0.040 / 0.050
G16     150.3          42.4               16.9 +/-    0.90      23.6 +/-    0.90  0.030 / 0.050
G22     219.5          72.1               14.9 +/-    0.98      15.5 +/-    0.98  0.050 / 0.090
G23     306.2          36.4               12.2 +/-    0.77      18.8 +/-    0.77  0.040 / 0.090
G26     101.4          53.8               13.8 +/-    0.58      16.6 +/-    0.58  0.110 / 0.240
G31     44.4           34.0                9.9 +/-    0.97      16.0 +/-    0.97  0.110 / 0.250