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               11.0 +/-    0.53      13.3 +/-    0.53  0.050 / 0.050
G05     134.6          66.0               11.0 +/-    1.02      11.9 +/-    1.02  0.050 / 0.060
G06     57.7           10.9                9.0 +/-    1.34      24.7 +/-    1.34  0.030 / 0.050
G12     191.5          59.6               13.1 +/-    1.05      14.9 +/-    1.05  0.030 / 0.040
G20     198.4          34.0               14.4 +/-    1.36      23.3 +/-    1.36  0.070 / 0.100
G25     279.3          59.8               12.9 +/-    0.76      14.7 +/-    0.76  0.050 / 0.100
G29     312.3          33.9               10.5 +/-    1.73      17.0 +/-    1.73  0.030 / 0.050