PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-21:42:50
G02     35.1           54.2                9.9 +/-    1.05      11.9 +/-    1.05  0.040 / 0.050
G05     134.6          66.0               10.7 +/-    0.26      11.5 +/-    0.26  0.060 / 0.050
G06     57.7           10.9                8.8 +/-    1.64      24.2 +/-    1.64  0.030 / 0.040
G12     191.5          59.6               12.9 +/-    0.74      14.7 +/-    0.74  0.030 / 0.040
G20     198.4          34.0               13.1 +/-    1.47      21.1 +/-    1.47  0.040 / 0.050
G25     279.3          59.8               17.9 +/-    0.81      20.4 +/-    0.81  0.040 / 0.040
G29     312.3          33.9                8.7 +/-    1.50      14.1 +/-    1.50  0.040 / 0.070