PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/19-19:12:00
G02     43.0           47.3                8.0 +/-    0.48      10.5 +/-    0.48  0.040 / 0.040
G05     105.3          69.6                9.5 +/-    0.85      10.0 +/-    0.85  0.040 / 0.030
G12     184.3          48.7               10.9 +/-    2.16      14.0 +/-    2.16  0.060 / 0.060
G25     269.6          58.9                9.4 +/-    1.10      10.8 +/-    1.10  0.060 / 0.050
G29     315.8          37.3                8.3 +/-    1.20      12.7 +/-    1.20  0.030 / 0.050