PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-20:28:00
G10     256.4          31.5                9.2 +/-    1.79      15.7 +/-    1.79  0.040 / 0.050
G13     48.1           25.7                9.0 +/-    2.63      17.3 +/-    2.63  0.040 / 0.050
G15     81.6           59.0                8.1 +/-    1.20       9.2 +/-    1.20  0.130 / 0.520
G16     288.7          14.9                5.3 +/-    2.73      13.1 +/-    2.73  0.120 / 0.490
G20     279.1          54.8                8.1 +/-    3.48       9.6 +/-    3.48  0.130 / 0.180
G21     342.9          64.7                8.9 +/-    0.44       9.7 +/-    0.44  0.160 / 0.190
G26     261.7          12.8                7.6 +/-    1.38      20.0 +/-    1.38  0.040 / 0.040
G29     166.3          43.2               10.3 +/-    0.99      14.2 +/-    0.99  0.030 / 0.030