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               11.7 +/-    0.65      11.9 +/-    0.65  0.070 / 0.140
G05     171.5          21.1               16.0 +/-    2.31      34.2 +/-    2.31  0.070 / 0.130
G06     40.3           49.9               10.8 +/-    0.66      13.7 +/-    0.66  0.030 / 0.040
G12     320.4          61.9                9.5 +/-    1.66      10.7 +/-    1.66  0.020 / 0.040
G17     79.3           15.1                7.8 +/-    1.35      19.3 +/-    1.35  0.110 / 0.230
G19     67.0           31.7               10.2 +/-    1.06      17.3 +/-    1.06  0.080 / 0.180
G24     238.9          30.3               13.9 +/-    2.00      24.3 +/-    2.00  0.110 / 0.220
G25     317.7          24.3               11.2 +/-    2.23      22.3 +/-    2.23  0.070 / 0.180