PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-15:27:40
G10     262.4          34.7                6.8 +/-    1.61      10.8 +/-    1.61  0.150 / 0.210
G13     44.7           22.6                4.4 +/-    2.52       9.0 +/-    2.52  0.170 / 0.190
G15     63.0           50.4                6.3 +/-    0.99       7.9 +/-    0.99  0.050 / 0.060
G16     287.1          12.4                5.5 +/-    1.40      14.6 +/-    1.40  0.060 / 0.080
G18     295.4          64.2                6.6 +/-    0.69       7.2 +/-    0.69  0.240 / 0.260
G20     49.8           40.8                4.3 +/-    1.05       6.1 +/-    1.05  0.280 / 0.350
G21     7.9            71.5                5.5 +/-    0.50       5.8 +/-    0.50  0.130 / 0.180
G24     124.9          11.4               -1.5 +/-   30.45      -4.0 +/-   30.45  0.220 / 0.240
G27     319.8          16.6                4.7 +/-    2.16      11.2 +/-    2.16  0.180 / 0.410
G29     165.7          31.9                8.3 +/-    1.18      14.0 +/-    1.18  0.240 / 0.550