PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-17:27:50
G02     225.5          66.6               11.4 +/-    1.52      12.3 +/-    1.52  0.060 / 0.100
G06     44.5           65.9                9.8 +/-    0.33      10.6 +/-    0.33  0.050 / 0.070
G12     321.2          45.3                7.0 +/-    1.15       9.3 +/-    1.15  0.040 / 0.070
G17     66.9           24.3                8.7 +/-    0.78      17.4 +/-    0.78  0.030 / 0.060
G19     51.9           41.4               10.0 +/-    1.01      14.2 +/-    1.01  0.070 / 0.130
G24     255.7          38.7               10.5 +/-    0.96      15.6 +/-    0.96  0.060 / 0.130