PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-12:58:00
G02     64.5           27.8                4.3 +/-    1.05       7.9 +/-    1.05  0.030 / 0.030
G05     52.9           57.3                6.2 +/-    0.66       7.3 +/-    0.66  0.030 / 0.040
G12     185.3          28.8                7.7 +/-    1.70      13.9 +/-    1.70  0.060 / 0.110
G13     125.6          18.3                5.4 +/-    1.56      12.4 +/-    1.56  0.070 / 0.100
G15     160.0          16.4                6.5 +/-    1.75      15.7 +/-    1.75  0.040 / 0.060
G20     212.4          62.5               12.7 +/-    0.49      14.1 +/-    0.49  0.060 / 0.060
G21     277.3          25.0                9.0 +/-    1.13      17.6 +/-    1.13  0.090 / 0.370
G25     230.1          48.2               11.0 +/-    1.95      14.2 +/-    1.95  0.090 / 0.440
G29     335.8          63.1                5.0 +/-    0.77       5.5 +/-    0.77  0.090 / 0.190