PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/17-21:57:30
G07     9.1            66.6                9.8 +/-    0.58      10.5 +/-    0.58  0.040 / 0.030
G08     71.0           49.7               10.1 +/-    1.18      12.8 +/-    1.18  0.060 / 0.040
G09     181.2          57.9               12.3 +/-    0.48      14.2 +/-    0.48  0.080 / 0.100
G11     134.2          23.6               12.7 +/-    2.89      25.7 +/-    2.89  0.060 / 0.140
G23     159.8          28.3               12.1 +/-    1.84      22.0 +/-    1.84  0.030 / 0.030
G27     45.4           24.7                9.3 +/-    2.28      18.4 +/-    2.28  0.030 / 0.040
G28     248.8          37.5               13.4 +/-    1.60      20.4 +/-    1.60  0.150 / 0.170
G30     313.6          45.1               11.1 +/-    0.75      15.0 +/-    0.75  0.080 / 0.140