PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-22:57:30
G02     201.4          30.1               16.0 +/-    1.84      27.9 +/-    1.84  0.160 / 0.410
G06     165.2          63.5               14.2 +/-    1.11      15.7 +/-    1.11  0.130 / 0.360
G12     304.5          11.2               -0.5 +/-   22.57      -1.3 +/-   22.57  0.080 / 0.120
G17     25.7           56.7               11.0 +/-    0.60      12.9 +/-    0.60  0.090 / 0.130
G19     345.1          68.4               10.2 +/-    0.74      10.9 +/-    0.74  0.070 / 0.110
G24     303.5          35.1               10.2 +/-    0.91      16.1 +/-    0.91  0.070 / 0.110
G28     97.3           34.4               11.7 +/-    0.73      18.7 +/-    0.73  0.050 / 0.120