PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/23-17:57:50
G05     46.5           24.8               10.1 +/-    1.12      19.8 +/-    1.12  0.040 / 0.050
G13     86.5           37.0               12.5 +/-    0.56      19.1 +/-    0.56  0.030 / 0.040
G15     132.4          47.5               14.3 +/-    0.95      18.6 +/-    0.95  0.100 / 0.210
G18     239.7          37.6               11.7 +/-    1.81      17.8 +/-    1.81  0.090 / 0.180
G20     18.5           73.8               11.5 +/-    0.81      11.9 +/-    0.81  0.050 / 0.120
G25     201.6          15.2               14.6 +/-    1.75      36.2 +/-    1.75  0.050 / 0.110
G26     299.2          18.3               10.6 +/-    1.14      24.3 +/-    1.14  0.040 / 0.140
G29     144.7          73.5               13.3 +/-    0.89      13.9 +/-    0.89  0.040 / 0.130