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               10.6 +/-    0.67      11.7 +/-    0.67  0.040 / 0.040
G08     82.9           53.4               11.2 +/-    0.35      13.5 +/-    0.35  0.040 / 0.040
G09     182.7          61.7               13.6 +/-    1.25      15.2 +/-    1.25  0.030 / 0.060
G11     139.2          20.0               12.7 +/-    1.57      27.9 +/-    1.57  0.030 / 0.050
G23     157.1          26.4               11.1 +/-    0.90      21.0 +/-    0.90  0.090 / 0.080
G27     46.1           24.9               10.8 +/-    1.87      21.2 +/-    1.87  0.080 / 0.070
G28     247.2          38.1               13.7 +/-    1.61      20.5 +/-    1.61  0.110 / 0.320
G30     311.4          43.2               10.4 +/-    1.37      14.4 +/-    1.37  0.130 / 0.300