PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/20-16:12:30
G02     202.0          26.4                9.2 +/-    1.56      17.4 +/-    1.56  0.050 / 0.060
G06     165.4          62.0               13.6 +/-    1.06      15.2 +/-    1.06  0.030 / 0.030
G17     25.8           56.6                7.7 +/-    0.96       9.0 +/-    0.96  0.050 / 0.080
G19     348.8          68.5                8.1 +/-    1.00       8.6 +/-    1.00  0.050 / 0.090
G24     304.5          33.9                7.2 +/-    1.53      11.7 +/-    1.53  0.030 / 0.030
G28     91.9           40.5                7.5 +/-    1.24      10.8 +/-    1.24  0.030 / 0.040