PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/22-18:28:00
G07     351.4          63.7               11.8 +/-    0.75      13.0 +/-    0.75  0.030 / 0.050
G08     84.2           54.1               13.4 +/-    0.32      16.2 +/-    0.32  0.030 / 0.040
G09     183.4          61.5               14.4 +/-    1.56      16.1 +/-    1.56  0.050 / 0.130
G11     139.5          20.2               17.5 +/-    1.89      38.2 +/-    1.89  0.050 / 0.210
G23     157.0          25.4               13.7 +/-    0.84      26.6 +/-    0.84  0.070 / 0.110
G27     45.6           24.3               10.7 +/-    1.01      21.2 +/-    1.01  0.070 / 0.110
G28     247.9          38.7               14.7 +/-    1.36      21.8 +/-    1.36  0.040 / 0.050
G30     312.6          44.4               10.4 +/-    0.97      14.2 +/-    0.97  0.040 / 0.060