PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-18:27:40
G02     25.8           60.9                8.7 +/-    0.75       9.9 +/-    0.75  0.030 / 0.050
G05     146.6          58.3               10.7 +/-    0.66      12.4 +/-    0.66  0.040 / 0.040
G06     52.3           16.9                8.3 +/-    0.76      19.8 +/-    0.76  0.020 / 0.040
G12     192.7          69.1                9.1 +/-    0.79       9.7 +/-    0.79  0.020 / 0.040
G19     95.4           15.2                9.3 +/-    0.64      23.0 +/-    0.64  0.070 / 0.110
G25     301.6          51.6                9.1 +/-    0.76      11.3 +/-    0.76  0.070 / 0.090
G29     303.8          23.7               10.7 +/-    1.92      21.6 +/-    1.92  0.040 / 0.060