PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/15-18:43:00
G02     53.3           38.4               16.5 +/-    0.38      24.6 +/-    0.38  0.070 / 0.060
G05     81.5           70.4               17.5 +/-    0.52      18.4 +/-    0.52  0.080 / 0.070
G12     187.0          40.6               19.2 +/-    1.56      27.7 +/-    1.56  0.040 / 0.060
G20     204.0          52.4               16.8 +/-    1.11      20.6 +/-    1.11  0.040 / 0.060
G21     265.6          13.8               18.6 +/-    3.20      47.5 +/-    3.20  0.140 / 0.250
G25     243.1          56.1               17.9 +/-    1.01      21.1 +/-    1.01  0.110 / 0.230
G29     326.2          51.3               14.6 +/-    1.00      18.1 +/-    1.00  0.020 / 0.030