PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-19:57:50
G02     295.1          80.2                9.5 +/-    0.53       9.6 +/-    0.53  0.060 / 0.030
G05     169.0          27.0               13.7 +/-    2.07      25.5 +/-    2.07  0.030 / 0.080
G06     41.1           43.8                8.4 +/-    1.02      11.5 +/-    1.02  0.130 / 0.140
G12     316.2          68.4                8.7 +/-    0.69       9.3 +/-    0.69  0.130 / 0.140
G17     84.3           11.5                9.5 +/-    1.81      25.8 +/-    1.81  0.120 / 0.170
G19     72.7           28.0                7.7 +/-    1.80      14.0 +/-    1.80  0.130 / 0.150
G24     233.4          26.2               12.1 +/-    1.63      23.0 +/-    1.63  0.030 / 0.040
G25     317.4          29.7                8.2 +/-    1.41      14.4 +/-    1.41  0.040 / 0.030