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               12.7 +/-    0.41      14.0 +/-    0.41  0.030 / 0.050
G08     84.2           54.1               12.3 +/-    0.88      14.8 +/-    0.88  0.050 / 0.050
G09     183.4          61.5               13.5 +/-    0.76      15.2 +/-    0.76  0.090 / 0.140
G11     139.5          20.2               17.4 +/-    1.61      38.2 +/-    1.61  0.070 / 0.140
G23     157.0          25.4               13.6 +/-    2.88      26.4 +/-    2.88  0.040 / 0.040
G27     45.6           24.3               10.6 +/-    1.73      21.2 +/-    1.73  0.040 / 0.030
G28     247.9          38.7               13.4 +/-    0.70      19.9 +/-    0.70  0.070 / 0.070
G30     312.6          44.4               10.9 +/-    0.88      14.8 +/-    0.88  0.080 / 0.070