PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-14:12:50
G02     329.6          80.6                9.1 +/-    0.56       9.2 +/-    0.56  0.060 / 0.120
G05     168.1          28.7               10.7 +/-    1.10      19.3 +/-    1.10  0.070 / 0.120
G06     40.4           45.6                6.2 +/-    1.30       8.3 +/-    1.30  0.030 / 0.040
G12     315.5          67.0                6.8 +/-    0.83       7.3 +/-    0.83  0.030 / 0.040
G17     84.9           11.3                9.3 +/-    2.23      25.3 +/-    2.23  0.100 / 0.130
G19     73.5           27.6                6.4 +/-    1.14      11.8 +/-    1.14  0.080 / 0.140
G24     232.4          25.3               10.5 +/-    1.92      20.3 +/-    1.92  0.130 / 0.310
G25     317.6          27.9                4.8 +/-    1.23       8.9 +/-    1.23  0.080 / 0.330
G29     286.1          11.3                5.0 +/-   12.09      13.6 +/-   12.09  0.030 / 0.050