PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-16:28:00
G07     350.3          63.5               11.6 +/-    0.80      12.8 +/-    0.80  0.030 / 0.030
G08     82.9           53.4               10.7 +/-    0.89      13.0 +/-    0.89  0.030 / 0.040
G09     182.7          61.7               12.0 +/-    0.43      13.5 +/-    0.43  0.080 / 0.070
G11     139.2          20.0               12.1 +/-    2.67      26.5 +/-    2.67  0.080 / 0.060
G23     157.1          26.4                9.7 +/-    1.01      18.4 +/-    1.01  0.040 / 0.040
G27     46.1           24.9               10.5 +/-    1.79      20.7 +/-    1.79  0.040 / 0.030
G28     247.2          38.1               13.1 +/-    1.35      19.6 +/-    1.35  0.080 / 0.100
G30     311.4          43.2               11.3 +/-    1.03      15.6 +/-    1.03  0.070 / 0.100