PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-14:58:00
G10     248.5          24.3                4.9 +/-    0.53       9.7 +/-    0.53  0.190 / 0.340
G13     56.7           32.2                4.5 +/-    1.72       7.6 +/-    1.72  0.120 / 0.270
G15     88.8           56.9                6.9 +/-    0.67       8.0 +/-    0.67  0.030 / 0.050
G16     302.0          13.8                1.4 +/-    1.27       3.5 +/-    1.27  0.030 / 0.040
G18     267.5          56.3                3.8 +/-    1.98       4.5 +/-    1.98  0.120 / 0.250
G20     38.5           53.5                4.0 +/-    0.60       4.9 +/-    0.60  0.160 / 0.300
G21     338.5          62.3                2.7 +/-    0.45       3.0 +/-    0.45  0.030 / 0.030
G26     272.4          16.3                4.4 +/-    1.69      10.5 +/-    1.69  0.040 / 0.040
G29     162.1          48.5                7.2 +/-    0.46       9.2 +/-    0.46  0.070 / 0.110