PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-21:42:40
G02     204.1          38.3               14.7 +/-    1.15      22.1 +/-    1.15  0.090 / 0.120
G06     151.2          72.8               12.4 +/-    0.42      12.9 +/-    0.42  0.100 / 0.130
G12     309.5          18.4               10.7 +/-    1.79      24.5 +/-    1.79  0.040 / 0.020
G17     36.1           49.4               10.1 +/-    1.07      12.9 +/-    1.07  0.030 / 0.020
G19     4.1            64.1               10.4 +/-    0.52      11.4 +/-    0.52  0.070 / 0.080
G24     294.2          39.7                7.1 +/-    6.96      10.4 +/-    6.96  0.110 / 0.120
G28     105.6          28.9               13.0 +/-    1.02      23.2 +/-    1.02  0.070 / 0.140