PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-19:42:40
G02     300.4          80.3               11.7 +/-    0.54      11.8 +/-    0.54  0.070 / 0.180
G05     169.0          27.5               15.2 +/-    1.07      28.1 +/-    1.07  0.060 / 0.160
G06     41.2           43.3               10.0 +/-    0.52      13.9 +/-    0.52  0.020 / 0.040
G12     315.6          68.9                9.3 +/-    0.47       9.9 +/-    0.47  0.020 / 0.040
G17     84.7           11.1                9.7 +/-    2.67      26.3 +/-    2.67  0.080 / 0.130
G19     73.3           27.6                8.8 +/-    0.55      16.2 +/-    0.55  0.080 / 0.130
G24     232.9          25.8               14.9 +/-    1.05      28.6 +/-    1.05  0.080 / 0.320
G25     317.4          30.5               11.0 +/-    1.37      19.2 +/-    1.37  0.120 / 0.370