PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-19:28:00
G02     33.5           55.5               15.5 +/-    0.56      18.4 +/-    0.56  0.020 / 0.050
G05     146.1          62.3               20.8 +/-    0.67      23.2 +/-    0.67  0.020 / 0.050
G06     55.4           14.2               10.4 +/-    2.02      26.3 +/-    2.02  0.030 / 0.060
G12     196.1          64.6               18.3 +/-    0.83      20.0 +/-    0.83  0.040 / 0.050
G20     198.2          29.7               22.7 +/-    4.03      40.0 +/-    4.03  0.030 / 0.040
G25     287.5          58.3               17.5 +/-    1.76      20.2 +/-    1.76  0.030 / 0.040
G29     310.4          32.2               14.1 +/-    1.06      23.6 +/-    1.06  0.060 / 0.120