PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-19:12:50
G02     227.0          66.2               11.6 +/-    0.99      12.5 +/-    0.99  0.040 / 0.040
G06     43.6           64.0               -2.3 +/-   21.53      -2.5 +/-   21.53  0.050 / 0.050
G12     321.6          47.5               11.9 +/-    4.58      15.6 +/-    4.58  0.260 / 0.350
G17     67.9           23.5               13.1 +/-   10.30      26.5 +/-   10.30  0.160 / 0.230
G19     53.3           40.6              -14.2 +/-   52.71     -20.5 +/-   52.71  0.070 / 0.080
G24     254.2          38.2                4.8 +/-   13.88       7.2 +/-   13.88  0.070 / 0.080
G25     315.8          11.7               -0.3 +/-   30.59      -0.8 +/-   30.59  0.040 / 0.040