PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/21-15:58:00
G02     43.5           46.1                7.3 +/-    1.00       9.6 +/-    1.00  0.040 / 0.030
G05     110.8          70.1                8.5 +/-    0.91       9.0 +/-    0.91  0.030 / 0.050
G12     187.4          52.2                9.5 +/-    1.15      11.7 +/-    1.15  0.060 / 0.060
G25     273.1          58.0               10.6 +/-    1.33      12.3 +/-    1.33  0.060 / 0.070
G29     316.2          37.9                7.1 +/-    1.04      10.7 +/-    1.04  0.050 / 0.040