PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-15:42:50
G02     200.9          17.0               15.6 +/-    1.58      37.0 +/-    1.58  0.080 / 0.150
G06     171.7          52.2               12.5 +/-    0.97      15.4 +/-    0.97  0.070 / 0.160
G13     230.1          14.3               12.5 +/-    2.90      31.5 +/-    2.90  0.120 / 0.400
G17     24.1           58.9                9.1 +/-    0.66      10.4 +/-    0.66  0.120 / 0.390
G19     325.5          71.6                9.4 +/-    0.54       9.8 +/-    0.54  0.100 / 0.250
G24     312.2          27.1                6.8 +/-    2.58      12.6 +/-    2.58  0.080 / 0.240
G28     86.8           40.3                9.2 +/-    0.76      13.3 +/-    0.76  0.020 / 0.040
G30     157.4          17.7               13.6 +/-    1.13      31.7 +/-    1.13  0.030 / 0.040