PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-18:58:00
G10     246.5          22.3               15.3 +/-    2.17      31.9 +/-    2.17  0.130 / 0.370
G13     59.6           33.7               14.7 +/-    1.04      23.9 +/-    1.04  0.130 / 0.430
G15     95.7           57.4               16.2 +/-    0.60      18.8 +/-    0.60  0.130 / 0.390
G16     305.4          13.1               10.6 +/-    1.90      27.6 +/-    1.90  0.130 / 0.380
G18     262.7          53.6               15.2 +/-    0.72      18.3 +/-    0.72  0.040 / 0.050
G20     38.6           53.5               13.6 +/-    0.33      16.5 +/-    0.33  0.030 / 0.050
G21     331.0          58.8               13.6 +/-    0.71      15.6 +/-    0.71  0.040 / 0.060
G26     278.0          16.6               10.8 +/-    1.64      25.8 +/-    1.64  0.040 / 0.050
G29     160.4          49.6               17.5 +/-    1.05      22.2 +/-    1.05  0.040 / 0.060