PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/20-13:58:00
G02     44.3           45.0                5.0 +/-    0.66       6.7 +/-    0.66  0.030 / 0.030
G05     117.4          70.2                7.4 +/-    0.63       7.8 +/-    0.63  0.020 / 0.020
G12     186.1          51.8                7.1 +/-    2.00       8.7 +/-    2.00  0.040 / 0.060
G25     273.9          58.1                6.8 +/-    1.15       7.9 +/-    1.15  0.040 / 0.050
G29     315.6          37.1                5.5 +/-    0.82       8.4 +/-    0.82  0.040 / 0.070