PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/16-17:57:30
G07     11.7           66.6               12.4 +/-    0.70      13.4 +/-    0.70  0.030 / 0.040
G08     74.6           50.9               12.7 +/-    0.60      15.8 +/-    0.60  0.030 / 0.040
G09     183.1          60.2               13.6 +/-    0.79      15.4 +/-    0.79  0.110 / 0.110
G11     135.4          22.9               13.4 +/-    2.00      27.6 +/-    2.00  0.140 / 0.140
G23     159.0          28.1               12.8 +/-    1.39      23.3 +/-    1.39  0.120 / 0.220
G27     45.7           24.8               11.4 +/-    1.50      22.4 +/-    1.50  0.090 / 0.150
G28     247.1          35.7               14.5 +/-    1.64      22.8 +/-    1.64  0.040 / 0.030
G30     313.9          45.8               12.8 +/-    1.26      17.0 +/-    1.26  0.050 / 0.050