PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-00:58:10
G07     318.0          52.4                4.3 +/-    0.65       5.2 +/-    0.65  0.040 / 0.030
G08     115.3          45.9                7.0 +/-    0.56       9.4 +/-    0.56  0.040 / 0.040
G09     238.1          84.0                5.4 +/-    0.32       5.4 +/-    0.32  0.060 / 0.050
G16     43.1           18.9                2.6 +/-    2.63       5.9 +/-    2.63  0.040 / 0.050
G23     150.4          58.4                6.5 +/-    0.60       7.5 +/-    0.60  0.240 / 0.440
G27     73.0           37.9                5.6 +/-    0.68       8.4 +/-    0.68  0.220 / 0.220
G28     227.6          16.5                4.0 +/-   12.31       9.6 +/-   12.31  0.270 / 0.280
G30     290.8          25.4                4.5 +/-    2.02       8.7 +/-    2.02  0.140 / 0.440