PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-22:42:50
G02     200.4          25.1               14.9 +/-    2.60      29.1 +/-    2.60  0.140 / 0.120
G06     168.6          58.1               13.7 +/-    0.73      15.9 +/-    0.73  0.120 / 0.120
G13     225.0          10.8               20.0 +/-    3.55      54.8 +/-    3.55  0.050 / 0.030
G17     19.8           60.3               10.7 +/-    0.96      12.1 +/-    0.96  0.040 / 0.040
G19     330.5          70.2               10.4 +/-    0.68      10.9 +/-    0.68  0.250 / 0.490
G24     307.6          32.0               10.4 +/-    0.99      17.5 +/-    0.99  0.210 / 0.480
G28     92.1           37.4               12.7 +/-    1.16      19.3 +/-    1.16  0.050 / 0.100
G30     157.1          10.3               17.2 +/-    2.82      47.7 +/-    2.82  0.070 / 0.090