PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-19:28:00
G02     262.7          78.1               13.2 +/-    0.44      13.4 +/-    0.44  0.030 / 0.030
G05     171.5          21.1               14.8 +/-    3.08      31.8 +/-    3.08  0.020 / 0.020
G06     40.3           49.9               12.0 +/-    0.66      15.1 +/-    0.66  0.080 / 0.110
G12     320.4          61.9               11.2 +/-    0.77      12.5 +/-    0.77  0.080 / 0.110
G17     79.3           15.1               10.5 +/-    2.43      26.0 +/-    2.43  0.090 / 0.180
G19     67.0           31.7               10.9 +/-    1.85      18.4 +/-    1.85  0.110 / 0.160
G24     238.9          30.3               13.9 +/-    1.91      24.2 +/-    1.91  0.030 / 0.040
G25     317.7          24.3               12.9 +/-    1.06      25.7 +/-    1.06  0.050 / 0.040