PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-22:57:40
G05     50.6           15.7                8.9 +/-    1.66      21.8 +/-    1.66  0.230 / 0.420
G10     240.6          16.4               21.6 +/-    2.25      52.1 +/-    2.25  0.080 / 0.370
G13     69.0           36.6               13.4 +/-    1.09      20.6 +/-    1.09  0.040 / 0.050
G15     115.7          55.7               15.8 +/-    0.34      18.7 +/-    0.34  0.040 / 0.050
G16     310.2          13.0                8.4 +/-    4.16      21.8 +/-    4.16  0.100 / 0.180
G18     251.9          46.4               14.5 +/-    4.26      19.2 +/-    4.26  0.110 / 0.150
G20     34.4           59.1               12.2 +/-    1.02      14.0 +/-    1.02  0.210 / 0.300
G21     319.4          51.7               11.8 +/-    0.82      14.6 +/-    0.82  0.140 / 0.220
G26     283.0          19.0               12.5 +/-    1.65      28.2 +/-    1.65  0.030 / 0.050
G29     158.7          61.7               16.3 +/-    0.34      18.2 +/-    0.34  0.030 / 0.040