PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-20:58:10
G10     247.3          23.0               16.0 +/-    2.88      32.8 +/-    2.88  0.140 / 0.400
G13     58.7           33.4               11.9 +/-    1.02      19.5 +/-    1.02  0.130 / 0.340
G15     95.0           57.7               14.5 +/-    0.43      16.8 +/-    0.43  0.050 / 0.060
G16     303.1          13.8               11.8 +/-    1.63      30.3 +/-    1.63  0.040 / 0.050
G18     263.6          53.6               16.7 +/-    0.92      20.2 +/-    0.92  0.110 / 0.310
G20     40.1           51.8               13.2 +/-    0.49      16.3 +/-    0.49  0.120 / 0.380
G21     330.6          58.6               14.9 +/-    0.40      17.2 +/-    0.40  0.050 / 0.120
G26     275.5          16.5               13.6 +/-    1.69      32.6 +/-    1.69  0.050 / 0.140
G29     161.6          49.9               14.6 +/-    1.10      18.5 +/-    1.10  0.060 / 0.070