PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-15:42:40
G01     307.9          32.5                8.9 +/-    1.07      14.8 +/-    1.07  0.030 / 0.050
G10     105.0          41.1                9.3 +/-    0.89      13.2 +/-    0.89  0.030 / 0.050
G11     286.0          26.9                7.3 +/-    1.23      13.7 +/-    1.23  0.060 / 0.140
G14     350.3          67.7                7.1 +/-    0.76       7.6 +/-    0.76  0.060 / 0.140
G22     309.7          26.6                5.6 +/-    2.26      10.5 +/-    2.26  0.080 / 0.220
G25     83.8           16.5                8.7 +/-    2.13      20.9 +/-    2.13  0.070 / 0.260
G31     166.1          64.6               11.6 +/-    1.19      12.7 +/-    1.19  0.040 / 0.050
G32     36.0           52.5                8.2 +/-    0.42      10.0 +/-    0.42  0.040 / 0.050