PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/05/07-16:27:50
G07     8.4            66.1               10.8 +/-    0.71      11.7 +/-    0.71  0.060 / 0.050
G08     78.5           51.8                9.8 +/-    0.78      12.1 +/-    0.78  0.050 / 0.080
G09     184.1          62.4               11.6 +/-    0.96      12.9 +/-    0.96  0.040 / 0.030
G11     137.0          21.6               10.7 +/-    1.59      22.6 +/-    1.59  0.030 / 0.040
G23     158.4          29.2               11.7 +/-    0.99      20.9 +/-    0.99  0.140 / 0.150
G27     46.8           25.9                9.5 +/-    1.85      18.3 +/-    1.85  0.130 / 0.100
G28     245.2          33.9               11.8 +/-    1.20      19.1 +/-    1.20  0.160 / 0.120
G30     312.9          45.1               10.6 +/-    0.94      14.2 +/-    0.94  0.120 / 0.120