PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-20:42:30
G02     31.1           57.0               10.4 +/-    0.92      12.2 +/-    0.92  0.020 / 0.030
G05     139.6          61.9               12.9 +/-    0.30      14.4 +/-    0.30  0.030 / 0.030
G06     54.1           14.6                8.7 +/-    2.90      21.9 +/-    2.90  0.030 / 0.030
G12     192.3          66.0               12.0 +/-    0.61      13.0 +/-    0.61  0.030 / 0.030
G19     98.7           12.4               10.9 +/-    1.58      28.8 +/-    1.58  0.050 / 0.080
G25     297.2          53.5               11.0 +/-    1.35      13.3 +/-    1.35  0.050 / 0.050
G29     306.4          26.5               11.3 +/-    1.49      21.3 +/-    1.49  0.160 / 0.240