PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-11:27:50
G02     199.7          17.0                6.4 +/-    1.17      15.1 +/-    1.17  0.050 / 0.110
G06     174.9          47.6                7.8 +/-    1.22      10.2 +/-    1.22  0.050 / 0.080
G13     231.8          15.9                6.1 +/-    2.42      14.7 +/-    2.42  0.110 / 0.300
G17     20.4           61.4                6.1 +/-    1.25       6.9 +/-    1.25  0.120 / 0.320
G19     315.4          72.0                6.1 +/-    1.06       6.4 +/-    1.06  0.030 / 0.050
G24     313.4          25.3                5.9 +/-    2.52      11.5 +/-    2.52  0.040 / 0.050
G28     84.0           41.4                5.8 +/-    0.75       8.3 +/-    0.75  0.060 / 0.080
G30     156.6          18.8                5.7 +/-    2.72      13.0 +/-    2.72  0.060 / 0.050