PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-16:58:10
G07     2.3            65.3                6.9 +/-    0.57       7.5 +/-    0.57  0.040 / 0.050
G08     82.7           52.1                8.3 +/-    0.75      10.3 +/-    0.75  0.030 / 0.050
G09     185.4          65.3                8.0 +/-    1.45       8.7 +/-    1.45  0.060 / 0.090
G11     138.8          19.9                9.4 +/-    1.35      20.8 +/-    1.35  0.060 / 0.120
G23     157.9          32.3               10.0 +/-    0.86      16.8 +/-    0.86  0.100 / 0.160
G27     48.8           27.7                5.5 +/-    1.16      10.1 +/-    1.16  0.070 / 0.170
G28     242.9          32.1               10.2 +/-    2.14      17.2 +/-    2.14  0.150 / 0.430
G30     310.4          42.9                6.9 +/-    1.02       9.6 +/-    1.02  0.130 / 0.370