PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/07-18:42:40
G02     40.8           49.2               17.7 +/-    0.96      22.5 +/-    0.96  0.030 / 0.040
G05     131.5          68.2               19.8 +/-    0.61      21.2 +/-    0.61  0.040 / 0.040
G06     59.5           9.4                15.5 +/-    2.29      43.7 +/-    2.29  0.020 / 0.050
G12     191.7          56.7               19.1 +/-    0.92      22.3 +/-    0.92  0.030 / 0.040
G20     199.6          36.9               19.2 +/-    1.07      29.4 +/-    1.07  0.060 / 0.120
G25     273.3          59.8               20.4 +/-    1.16      23.2 +/-    1.16  0.070 / 0.140
G29     315.9          38.5               17.1 +/-    0.88      25.5 +/-    0.88  0.030 / 0.030