PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-22:57:40
G02     232.2          72.9                9.3 +/-    0.37       9.7 +/-    0.37  0.030 / 0.040
G05     172.4          13.5               18.5 +/-    2.09      47.8 +/-    2.09  0.030 / 0.040
G06     42.1           61.6                9.0 +/-    0.44      10.1 +/-    0.44  0.210 / 0.230
G12     321.5          48.7                9.3 +/-    0.45      12.0 +/-    0.45  0.180 / 0.210
G17     66.2           27.2                7.5 +/-    0.95      13.9 +/-    0.95  0.030 / 0.030
G19     51.7           42.5                8.7 +/-    1.86      12.1 +/-    1.86  0.040 / 0.030
G24     249.3          36.9               12.7 +/-    0.81      19.4 +/-    0.81  0.060 / 0.080