PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/20-20:27:50
G02     48.2           42.1                7.1 +/-    0.91      10.0 +/-    0.91  0.040 / 0.060
G05     86.2           68.9                8.6 +/-    0.63       9.1 +/-    0.63  0.030 / 0.060
G12     188.2          47.9               10.3 +/-    0.60      13.3 +/-    0.60  0.030 / 0.060
G25     261.5          57.9                9.0 +/-    1.47      10.4 +/-    1.47  0.040 / 0.050
G29     320.7          43.6                8.5 +/-    0.59      11.7 +/-    0.59  0.050 / 0.070