PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/31-19:27:40
G02     42.2           47.2                7.5 +/-    0.62       9.7 +/-    0.62  0.040 / 0.040
G05     108.7          69.3                8.9 +/-    0.39       9.4 +/-    0.39  0.040 / 0.060
G12     190.3          55.2                8.4 +/-    0.56      10.0 +/-    0.56  0.060 / 0.070
G25     275.7          57.9               14.9 +/-    1.36      17.2 +/-    1.36  0.060 / 0.060
G29     315.9          37.8                7.7 +/-    0.62      11.7 +/-    0.62  0.030 / 0.050