PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-17:57:50
G07     36.8           68.0               12.3 +/-    0.69      13.2 +/-    0.69  0.030 / 0.040
G08     61.3           46.9               12.0 +/-    1.27      15.8 +/-    1.27  0.030 / 0.030
G09     180.6          49.9               14.4 +/-    0.81      18.2 +/-    0.81  0.060 / 0.060
G11     128.0          29.1               15.6 +/-    1.38      27.8 +/-    1.38  0.060 / 0.050
G18     111.6          10.8               15.1 +/-    2.90      41.5 +/-    2.90  0.080 / 0.100
G23     160.2          18.6               13.7 +/-    2.16      31.1 +/-    2.16  0.120 / 0.080
G27     40.7           17.8                9.3 +/-    2.14      21.6 +/-    2.14  0.210 / 0.340
G28     256.8          42.2               14.8 +/-    2.15      20.7 +/-    2.15  0.180 / 0.360
G30     322.6          52.9               12.0 +/-    0.87      14.7 +/-    0.87  0.150 / 0.360