PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-17:43:00
G02     233.3          71.1               12.0 +/-    0.59      12.6 +/-    0.59  0.070 / 0.080
G05     176.1          11.1               11.3 +/-   33.59      30.7 +/-   33.59  0.050 / 0.080
G06     41.6           60.9               11.1 +/-    0.36      12.5 +/-    0.36  0.030 / 0.060
G12     321.7          50.3               11.1 +/-    1.00      13.9 +/-    1.00  0.030 / 0.080
G17     70.9           21.3                8.8 +/-    1.46      18.7 +/-    1.46  0.110 / 0.310
G19     56.9           38.3               11.3 +/-    0.69      16.9 +/-    0.69  0.140 / 0.340
G24     249.8          36.4               12.8 +/-    0.72      19.8 +/-    0.72  0.130 / 0.250
G25     316.6          14.4               10.1 +/-    3.08      25.6 +/-    3.08  0.070 / 0.200