PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/31-20:42:40
G02     202.2          31.0               20.2 +/-    0.76      34.7 +/-    0.76  0.220 / 0.240
G06     161.8          66.1               18.0 +/-    0.37      19.5 +/-    0.37  0.080 / 0.230
G12     305.9          13.6               16.2 +/-    2.58      41.8 +/-    2.58  0.090 / 0.100
G17     29.9           53.9               16.3 +/-    1.00      19.6 +/-    1.00  0.100 / 0.110
G19     347.7          67.8               16.0 +/-    0.39      17.2 +/-    0.39  0.050 / 0.030
G24     301.3          36.5               16.6 +/-    2.58      25.6 +/-    2.58  0.040 / 0.030
G28     99.0           33.4               16.0 +/-    1.18      26.2 +/-    1.18  0.050 / 0.040