PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/24-21:28:10
G02     30.8           57.5                8.5 +/-    0.57       9.8 +/-    0.57  0.040 / 0.050
G05     143.2          62.4               11.4 +/-    0.83      12.7 +/-    0.83  0.040 / 0.050
G06     55.2           14.1                6.6 +/-    1.71      16.8 +/-    1.71  0.030 / 0.040
G12     194.7          64.6                9.3 +/-    1.31      10.2 +/-    1.31  0.040 / 0.050
G20     197.8          29.5               15.1 +/-    1.95      26.8 +/-    1.95  0.040 / 0.040
G25     288.3          58.3                9.4 +/-    1.29      10.9 +/-    1.29  0.020 / 0.040
G29     309.3          30.6                8.3 +/-    1.48      14.3 +/-    1.48  0.060 / 0.140