PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/31-20:13:00
G02     199.9          17.6               16.9 +/-    2.50      39.4 +/-    2.50  0.100 / 0.140
G06     170.9          51.1               16.8 +/-    0.39      20.9 +/-    0.39  0.100 / 0.110
G13     229.8          15.3               18.4 +/-    1.50      45.4 +/-    1.50  0.120 / 0.190
G17     13.5           64.2               15.2 +/-    0.52      16.7 +/-    0.52  0.100 / 0.160
G19     305.2          70.7               15.1 +/-    0.62      16.0 +/-    0.62  0.040 / 0.040
G24     311.9          27.5               13.9 +/-    1.72      25.7 +/-    1.72  0.040 / 0.040
G28     84.3           41.5               14.9 +/-    1.07      21.2 +/-    1.07  0.030 / 0.030
G30     156.6          17.5               16.1 +/-    1.66      37.7 +/-    1.66  0.040 / 0.050