PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/17-19:58:00
G02     35.5           53.9               11.7 +/-    1.52      14.1 +/-    1.52  0.040 / 0.040
G05     141.0          64.6               15.6 +/-    0.70      17.1 +/-    0.70  0.040 / 0.050
G06     56.8           12.3                7.9 +/-    0.96      21.0 +/-    0.96  0.030 / 0.030
G12     193.7          61.7               14.4 +/-    0.91      16.1 +/-    0.91  0.030 / 0.030
G20     198.5          32.3               19.1 +/-    1.62      31.8 +/-    1.62  0.040 / 0.040
G25     282.1          59.4               14.8 +/-    2.45      16.9 +/-    2.45  0.040 / 0.030
G29     312.0          33.8                9.7 +/-    1.85      15.8 +/-    1.85  0.020 / 0.030