PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-23:12:50
G02     200.5          25.9               13.1 +/-    1.71      25.1 +/-    1.71  0.040 / 0.040
G06     168.6          58.6               12.6 +/-    0.58      14.5 +/-    0.58  0.040 / 0.030
G17     20.0           60.2               10.3 +/-    0.94      11.7 +/-    0.94  0.100 / 0.130
G19     333.0          70.0                9.8 +/-    0.64      10.4 +/-    0.64  0.080 / 0.110
G24     307.2          32.3                9.4 +/-    1.66      15.6 +/-    1.66  0.090 / 0.090
G28     92.8           37.0               11.1 +/-    1.31      17.0 +/-    1.31  0.050 / 0.100