PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/25-21:27:50
G02     32.3           56.4               12.0 +/-    0.87      14.1 +/-    0.87  0.040 / 0.050
G05     141.0          63.6               14.4 +/-    0.41      15.9 +/-    0.41  0.030 / 0.050
G06     55.9           13.1                9.1 +/-    1.23      23.6 +/-    1.23  0.020 / 0.040
G12     193.7          63.1               15.6 +/-    0.38      17.3 +/-    0.38  0.040 / 0.040
G20     198.0          30.8               15.7 +/-    1.67      27.1 +/-    1.67  0.030 / 0.040
G25     285.5          58.9               14.2 +/-    2.47      16.2 +/-    2.47  0.030 / 0.040
G29     310.3          31.7               11.9 +/-    1.01      20.2 +/-    1.01  0.070 / 0.130