PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-21:28:00
G02     28.3           59.3               10.5 +/-    0.39      12.1 +/-    0.39  0.040 / 0.050
G05     146.6          60.4               11.6 +/-    0.67      13.2 +/-    0.67  0.040 / 0.060
G06     54.0           15.8                7.7 +/-    0.90      18.8 +/-    0.90  0.030 / 0.040
G12     196.9          67.1               11.3 +/-    1.27      12.1 +/-    1.27  0.030 / 0.050
G20     197.6          27.2               13.5 +/-    2.97      25.2 +/-    2.97  0.120 / 0.120
G25     292.5          57.1               11.8 +/-    1.61      13.7 +/-    1.61  0.060 / 0.100
G29     307.7          28.9                9.6 +/-    1.50      17.2 +/-    1.50  0.030 / 0.040