PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/13-20:12:30
G02     34.7           54.5                8.8 +/-    0.94      10.6 +/-    0.94  0.030 / 0.040
G05     141.5          64.2               10.6 +/-    0.47      11.7 +/-    0.47  0.040 / 0.040
G06     56.5           12.6                7.5 +/-    1.68      19.8 +/-    1.68  0.040 / 0.050
G12     193.9          62.3               10.1 +/-    0.69      11.2 +/-    0.69  0.050 / 0.050
G20     198.4          31.8               12.7 +/-    1.80      21.5 +/-    1.80  0.030 / 0.040
G25     283.0          59.3               14.2 +/-    2.74      16.3 +/-    2.74  0.030 / 0.030
G29     311.5          33.2                8.3 +/-    1.86      13.7 +/-    1.86  0.030 / 0.040