PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-21:12:40
G02     11.8           69.1               13.1 +/-    1.07      13.9 +/-    1.07  0.050 / 0.070
G05     158.5          48.3               17.1 +/-    0.95      22.0 +/-    0.95  0.060 / 0.060
G06     48.0           25.3               12.4 +/-    1.02      24.1 +/-    1.02  0.100 / 0.190
G12     227.6          78.7               14.2 +/-    0.93      14.5 +/-    0.93  0.100 / 0.180
G19     90.9           15.6               12.7 +/-    1.64      31.1 +/-    1.64  0.110 / 0.390
G20     196.9          15.5               23.2 +/-    3.84      57.0 +/-    3.84  0.130 / 0.280
G24     217.9          11.9               20.2 +/-    3.44      54.0 +/-    3.44  0.040 / 0.050
G25     308.3          48.2               15.1 +/-    2.18      19.5 +/-    2.18  0.040 / 0.050
G29     299.0          20.2               15.0 +/-    2.53      32.8 +/-    2.53  0.050 / 0.050