PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-12:58:00
G01     253.6          36.3                7.1 +/-    1.21      11.0 +/-    1.21  0.040 / 0.090
G03     316.2          44.4                5.2 +/-    1.70       7.1 +/-    1.70  0.040 / 0.070
G11     240.4          13.6                7.1 +/-    3.29      18.4 +/-    3.29  0.140 / 0.240
G14     54.9           45.2                6.1 +/-    0.61       8.1 +/-    0.61  0.150 / 0.320
G18     223.3          29.4                7.8 +/-    0.96      13.9 +/-    0.96  0.050 / 0.080
G22     303.7          70.1                7.8 +/-    0.70       8.3 +/-    0.70  0.040 / 0.080
G25     41.8           11.7                5.7 +/-    3.23      15.2 +/-    3.23  0.080 / 0.090
G26     135.9          37.1               10.0 +/-    0.70      15.3 +/-    0.70  0.050 / 0.110
G31     41.7           58.3                6.2 +/-    0.62       7.1 +/-    0.62  0.150 / 0.510
G32     76.5           22.7                5.7 +/-    0.56      11.7 +/-    0.56  0.180 / 0.460