PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-23:27:40
G02     204.2          40.2               17.5 +/-    0.61      25.4 +/-    0.61  0.030 / 0.020
G06     150.4          73.6               15.6 +/-    0.62      16.2 +/-    0.62  0.030 / 0.030
G12     309.9          18.6               10.9 +/-    1.49      24.9 +/-    1.49  0.090 / 0.140
G17     36.0           49.6               11.8 +/-    1.15      15.0 +/-    1.15  0.090 / 0.160
G19     7.9            63.1               12.1 +/-    0.44      13.4 +/-    0.44  0.070 / 0.080
G24     293.1          39.9                9.2 +/-    5.52      13.5 +/-    5.52  0.080 / 0.090
G28     106.8          28.0               15.3 +/-    1.23      28.0 +/-    1.23  0.080 / 0.130