PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-22:28:10
G02     215.2          59.9               12.5 +/-    0.73      14.2 +/-    0.73  0.050 / 0.080
G06     58.8           74.3               11.9 +/-    0.46      12.3 +/-    0.46  0.070 / 0.080
G12     318.5          36.0               10.3 +/-    1.21      16.0 +/-    1.21  0.060 / 0.110
G17     55.0           35.3                9.5 +/-    1.03      15.0 +/-    1.03  0.040 / 0.090
G19     36.6           50.9                9.8 +/-    0.69      12.2 +/-    0.69  0.120 / 0.300
G24     266.1          41.8               12.8 +/-    1.15      18.1 +/-    1.15  0.170 / 0.340
G28     122.2          14.0               14.2 +/-    0.72      36.1 +/-    0.72  0.030 / 0.050