PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-21:57:40
G02     201.8          30.8               13.3 +/-    1.53      22.9 +/-    1.53  0.060 / 0.100
G06     168.7          62.5               12.6 +/-    0.47      14.0 +/-    0.47  0.050 / 0.080
G17     32.3           52.0               10.3 +/-    1.39      12.7 +/-    1.39  0.080 / 0.100
G19     351.9          67.6               10.0 +/-    1.03      10.7 +/-    1.03  0.090 / 0.110
G24     301.3          36.5                9.6 +/-    2.14      14.9 +/-    2.14  0.030 / 0.030
G28     95.5           37.8               11.7 +/-    1.17      17.7 +/-    1.17  0.030 / 0.030