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               12.6 +/-    0.76      12.7 +/-    0.76  0.030 / 0.030
G05     169.0          27.5               16.8 +/-    2.01      31.0 +/-    2.01  0.030 / 0.030
G06     41.2           43.3               10.7 +/-    1.02      14.7 +/-    1.02  0.190 / 0.130
G12     315.6          68.9               10.4 +/-    0.66      11.0 +/-    0.66  0.150 / 0.160
G17     84.7           11.1               10.3 +/-    2.36      27.9 +/-    2.36  0.110 / 0.120
G19     73.3           27.6                8.7 +/-    2.03      15.9 +/-    2.03  0.090 / 0.150
G24     232.9          25.8               14.3 +/-    1.52      27.3 +/-    1.52  0.030 / 0.030
G25     317.4          30.5               11.5 +/-    1.48      20.0 +/-    1.48  0.020 / 0.040