PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-21:27:50
G01     69.0           32.7               12.1 +/-    0.89      20.1 +/-    0.89  0.050 / 0.070
G07     138.4          30.0               13.1 +/-    1.21      23.0 +/-    1.21  0.040 / 0.080
G11     53.6           30.9               10.5 +/-    1.14      18.0 +/-    1.14  0.050 / 0.130
G13     272.8          37.2               13.5 +/-    1.11      20.6 +/-    1.11  0.060 / 0.120
G15     301.1          15.6                7.9 +/-    1.95      19.5 +/-    1.95  0.060 / 0.130
G17     234.3          65.5               13.9 +/-    0.82      15.1 +/-    0.82  0.050 / 0.120
G18     48.2           17.8                9.2 +/-    0.79      21.3 +/-    0.79  0.050 / 0.140
G19     225.5          42.6               14.3 +/-    1.08      19.9 +/-    1.08  0.070 / 0.120
G28     23.1           58.8               11.7 +/-    0.35      13.5 +/-    0.35  0.030 / 0.050
G30     137.0          58.4               13.0 +/-    0.55      15.0 +/-    0.55  0.030 / 0.070