PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-22:57:50
G05     52.8           11.6                9.7 +/-    1.91      26.1 +/-    1.91  0.110 / 0.370
G10     244.6          20.4               15.6 +/-    3.03      34.1 +/-    3.03  0.090 / 0.370
G13     62.5           34.9               16.0 +/-    0.63      25.5 +/-    0.63  0.040 / 0.050
G15     104.6          57.6               17.3 +/-    1.45      20.1 +/-    1.45  0.040 / 0.040
G16     305.2          14.0               12.3 +/-    1.72      31.4 +/-    1.72  0.170 / 0.220
G18     258.4          50.5               15.4 +/-    2.32      19.4 +/-    2.32  0.100 / 0.170
G20     38.3           54.2               14.0 +/-    0.89      16.9 +/-    0.89  0.080 / 0.150
G21     325.3          55.5               14.7 +/-    0.62      17.5 +/-    0.62  0.210 / 0.160
G26     277.6          17.8               14.7 +/-    0.69      34.2 +/-    0.69  0.030 / 0.030
G29     161.2          55.3               15.8 +/-    0.54      18.7 +/-    0.54  0.030 / 0.040