PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-21:13:10
G02     200.2          21.4               19.1 +/-    1.80      40.6 +/-    1.80  0.040 / 0.040
G06     169.7          54.9               16.2 +/-    0.89      19.3 +/-    0.89  0.040 / 0.040
G13     227.2          12.9               19.7 +/-    4.32      51.6 +/-    4.32  0.100 / 0.180
G17     17.3           62.0               12.8 +/-    0.80      14.3 +/-    0.80  0.130 / 0.140
G19     318.3          70.7               12.4 +/-    0.66      13.1 +/-    0.66  0.110 / 0.160
G24     309.8          29.9               10.7 +/-    1.75      18.7 +/-    1.75  0.110 / 0.130
G28     88.4           39.4               13.6 +/-    0.68      20.0 +/-    0.68  0.170 / 0.350
G30     157.0          13.8               18.0 +/-    2.65      46.0 +/-    2.65  0.160 / 0.350