PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-16:12:30
G02     313.8          81.0                7.9 +/-    0.50       8.0 +/-    0.50  0.110 / 0.120
G05     169.9          26.4               12.5 +/-    2.14      23.7 +/-    2.14  0.150 / 0.130
G06     40.6           45.5                8.2 +/-    1.24      11.0 +/-    1.24  0.070 / 0.210
G12     316.5          66.5                8.8 +/-    0.89       9.5 +/-    0.89  0.190 / 0.200
G17     84.1           11.6               10.2 +/-    2.41      27.4 +/-    2.41  0.030 / 0.030
G19     72.5           28.2                7.7 +/-    1.99      14.0 +/-    1.99  0.020 / 0.030
G24     233.5          26.2                9.6 +/-    1.80      18.3 +/-    1.80  0.080 / 0.040
G25     317.6          27.9                8.2 +/-    2.15      15.1 +/-    2.15  0.040 / 0.040