PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-19:43:00
G02     39.6           50.3               14.7 +/-    0.72      18.4 +/-    0.72  0.030 / 0.060
G05     132.8          67.8               18.3 +/-    0.40      19.6 +/-    0.40  0.030 / 0.060
G12     191.4          57.0               19.5 +/-    0.96      22.7 +/-    0.96  0.040 / 0.070
G20     199.3          36.6               22.5 +/-    0.68      34.6 +/-    0.68  0.040 / 0.060
G25     273.3          60.1               17.2 +/-    1.21      19.5 +/-    1.21  0.030 / 0.040
G29     315.1          37.4               15.3 +/-    1.07      23.2 +/-    1.07  0.030 / 0.040