PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/17-20:27:50
G10     251.4          27.6               14.5 +/-    1.80      26.8 +/-    1.80  0.040 / 0.050
G13     52.5           29.1               10.8 +/-    0.97      19.3 +/-    0.97  0.040 / 0.050
G15     93.9           60.1               13.9 +/-    0.45      15.7 +/-    0.45  0.140 / 0.630
G16     294.1          15.6                9.1 +/-    2.95      22.4 +/-    2.95  0.140 / 0.750
G20     271.1          51.4               12.6 +/-    1.01      15.6 +/-    1.01  0.060 / 0.170
G21     335.2          60.9               13.1 +/-    0.44      14.7 +/-    0.44  0.060 / 0.190
G26     266.7          15.2               13.3 +/-    1.03      33.0 +/-    1.03  0.030 / 0.030
G29     165.1          49.4               14.1 +/-    0.85      17.9 +/-    0.85  0.030 / 0.040