PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-12:57:40
G02     81.6           14.0                3.5 +/-    1.88       9.0 +/-    1.88  0.050 / 0.070
G05     44.6           36.1                1.4 +/-    0.76       2.2 +/-    0.76  0.030 / 0.070
G13     104.8          31.7                4.5 +/-    1.40       7.6 +/-    1.40  0.210 / 0.320
G15     146.1          35.2                5.5 +/-    1.66       8.8 +/-    1.66  0.220 / 0.290
G18     229.1          26.1                2.3 +/-    2.21       4.3 +/-    2.21  0.040 / 0.040
G20     268.8          83.5                2.1 +/-    0.82       2.1 +/-    0.82  0.030 / 0.030
G21     296.1          37.3                2.1 +/-    2.28       3.2 +/-    2.28  0.160 / 0.240
G25     211.5          29.2                2.5 +/-    2.89       4.4 +/-    2.89  0.130 / 0.190
G26     310.5          16.0                0.4 +/-   11.29       1.0 +/-   11.29  0.040 / 0.090
G29     22.5           84.4                1.4 +/-    0.35       1.4 +/-    0.35  0.060 / 0.100