PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/25-11:57:40
G02     57.9           33.3                3.8 +/-    1.73       6.2 +/-    1.73  0.040 / 0.030
G05     64.3           64.1                4.8 +/-    0.61       5.2 +/-    0.61  0.040 / 0.030
G12     187.2          37.8                6.5 +/-    0.94       9.8 +/-    0.94  0.040 / 0.070
G13     132.1          12.6                8.5 +/-    4.45      22.4 +/-    4.45  0.060 / 0.060
G20     207.5          52.9                8.8 +/-    0.55      10.8 +/-    0.55  0.030 / 0.040
G21     270.0          19.2                3.9 +/-    1.65       8.7 +/-    1.65  0.040 / 0.040
G25     242.7          54.2                8.6 +/-    2.58      10.4 +/-    2.58  0.060 / 0.060
G29     328.8          54.5                3.8 +/-    1.09       4.6 +/-    1.09  0.040 / 0.050