PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/28-22:58:00
G07     304.9          45.3                8.1 +/-    1.76      10.9 +/-    1.76  0.030 / 0.050
G08     131.2          39.2               12.3 +/-    0.92      18.2 +/-    0.92  0.030 / 0.040
G09     308.6          76.0                9.0 +/-    1.00       9.2 +/-    1.00  0.050 / 0.080
G16     41.7           27.3                6.7 +/-    2.12      12.5 +/-    2.12  0.050 / 0.070
G23     142.4          64.8               11.1 +/-    0.76      12.1 +/-    0.76  0.060 / 0.080
G27     80.2           36.9                9.0 +/-    0.67      13.9 +/-    0.67  0.040 / 0.080
G28     223.4          11.9                6.5 +/-   12.67      17.5 +/-   12.67  0.080 / 0.170
G30     286.0          24.1                9.3 +/-    1.31      18.6 +/-    1.31  0.090 / 0.170