PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-19:27:40
G01     119.0          18.1               15.4 +/-    2.19      35.4 +/-    2.19  0.120 / 0.240
G07     80.2           66.8               13.2 +/-    0.74      14.3 +/-    0.74  0.120 / 0.200
G08     46.0           34.6               11.1 +/-    1.17      17.8 +/-    1.17  0.050 / 0.070
G09     177.4          26.3               14.3 +/-    1.58      27.2 +/-    1.58  0.040 / 0.070
G11     108.5          40.0               14.6 +/-    0.42      21.3 +/-    0.42  0.090 / 0.270
G13     317.7          19.3               10.5 +/-    1.33      23.6 +/-    1.33  0.110 / 0.280
G17     203.1          20.9               15.9 +/-    2.14      34.3 +/-    2.14  0.030 / 0.030
G18     94.6           20.9               12.5 +/-    2.11      26.9 +/-    2.11  0.040 / 0.030
G28     293.8          57.6               12.8 +/-    1.18      14.8 +/-    1.18  0.030 / 0.030
G30     350.9          69.9               12.8 +/-    0.96      13.5 +/-    0.96  0.030 / 0.040