PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-17:27:40
G02     225.5          66.6               10.2 +/-    0.96      11.0 +/-    0.96  0.070 / 0.090
G06     44.5           65.9               10.1 +/-    0.43      11.0 +/-    0.43  0.060 / 0.070
G12     321.2          45.3                8.7 +/-    0.81      11.7 +/-    0.81  0.050 / 0.040
G17     66.9           24.3                9.6 +/-    0.42      19.0 +/-    0.42  0.040 / 0.050
G19     51.9           41.4                9.5 +/-    0.72      13.5 +/-    0.72  0.060 / 0.100
G24     255.7          38.7                9.6 +/-    2.17      14.2 +/-    2.17  0.080 / 0.090