PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/26-21:27:50
G02     34.2           54.9                8.5 +/-    0.89      10.1 +/-    0.89  0.040 / 0.050
G05     137.6          65.0                8.9 +/-    1.06       9.7 +/-    1.06  0.040 / 0.050
G06     57.0           11.8                7.5 +/-    1.63      20.2 +/-    1.63  0.050 / 0.050
G12     192.4          61.1                9.9 +/-    1.29      11.1 +/-    1.29  0.040 / 0.050
G20     198.3          32.7               11.5 +/-    1.32      19.0 +/-    1.32  0.050 / 0.100
G25     281.6          59.6                8.9 +/-    0.57      10.2 +/-    0.57  0.080 / 0.100
G29     311.5          33.1                7.8 +/-    1.48      12.8 +/-    1.48  0.030 / 0.040