PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-20:57:20
G02     357.7          74.2               12.9 +/-    0.48      13.4 +/-    0.48  0.030 / 0.030
G05     162.6          41.4               16.9 +/-    1.18      24.1 +/-    1.18  0.040 / 0.030
G06     45.2           30.9               11.0 +/-    1.10      19.0 +/-    1.10  0.020 / 0.020
G12     270.6          80.1               14.9 +/-    1.12      15.2 +/-    1.12  0.030 / 0.030
G19     85.2           19.6               12.6 +/-    1.04      27.9 +/-    1.04  0.070 / 0.080
G25     313.1          42.3               14.3 +/-    1.01      20.0 +/-    1.01  0.070 / 0.060
G29     294.0          15.8               13.2 +/-    1.68      32.2 +/-    1.68  0.040 / 0.060