PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/09-13:27:30
G02     66.3           26.3                1.0 +/-    1.68       1.9 +/-    1.68  0.040 / 0.020
G05     50.9           55.3                3.9 +/-    0.47       4.7 +/-    0.47  0.040 / 0.020
G12     184.8          26.3                4.3 +/-    0.89       8.1 +/-    0.89  0.110 / 0.140
G13     123.7          20.0                6.6 +/-    2.01      14.5 +/-    2.01  0.110 / 0.120
G15     158.7          18.4                4.7 +/-    1.17      10.8 +/-    1.17  0.030 / 0.030
G20     214.1          65.5                5.3 +/-    0.72       5.8 +/-    0.72  0.030 / 0.030
G21     279.2          26.1                5.0 +/-    1.50       9.6 +/-    1.50  0.060 / 0.060
G25     227.0          46.2                6.6 +/-    2.25       8.7 +/-    2.25  0.060 / 0.120
G29     338.3          65.8                2.5 +/-    0.33       2.7 +/-    0.33  0.160 / 0.200