PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-19:58:00
G02     256.4          76.9               10.8 +/-    1.19      11.1 +/-    1.19  0.090 / 0.190
G05     171.5          20.3               13.5 +/-    1.31      29.5 +/-    1.31  0.080 / 0.170
G06     40.3           50.9               10.0 +/-    0.33      12.4 +/-    0.33  0.060 / 0.220
G12     320.9          60.9               10.3 +/-    1.25      11.6 +/-    1.25  0.070 / 0.160
G17     78.3           15.8                9.2 +/-    1.88      22.5 +/-    1.88  0.090 / 0.340
G19     65.9           32.5                9.7 +/-    1.04      16.1 +/-    1.04  0.080 / 0.260
G24     240.0          31.1               13.8 +/-    0.85      23.7 +/-    0.85  0.030 / 0.040
G25     317.7          22.8                8.4 +/-    2.90      17.2 +/-    2.90  0.040 / 0.050