PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-04:12:40
G01     116.7          19.7                7.5 +/-    1.54      16.5 +/-    1.54  0.040 / 0.050
G07     87.6           64.7                4.9 +/-    0.92       5.4 +/-    0.92  0.040 / 0.050
G08     44.0           29.1                4.4 +/-    2.07       7.9 +/-    2.07  0.080 / 0.110
G09     177.0          23.8                6.9 +/-    1.06      13.9 +/-    1.06  0.110 / 0.110
G11     104.2          40.4                5.0 +/-    0.66       7.2 +/-    0.66  0.220 / 0.160
G13     317.0          20.3                1.8 +/-    1.66       3.9 +/-    1.66  0.110 / 0.120
G17     202.3          28.1                5.6 +/-    1.50      10.2 +/-    1.50  0.120 / 0.110
G28     299.2          58.7                3.2 +/-    0.80       3.7 +/-    0.80  0.120 / 0.120
G30     357.4          71.9                4.2 +/-    0.62       4.4 +/-    0.62  0.140 / 0.170