PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-11:58:10
G02     62.5           29.4                3.0 +/-    0.67       5.3 +/-    0.67  0.020 / 0.030
G05     55.4           59.2                4.8 +/-    0.54       5.5 +/-    0.54  0.020 / 0.030
G12     185.9          31.6                4.0 +/-    1.09       6.7 +/-    1.09  0.040 / 0.030
G13     127.6          16.6                6.0 +/-    1.82      14.3 +/-    1.82  0.040 / 0.040
G15     161.3          14.5                4.9 +/-    1.31      12.3 +/-    1.31  0.090 / 0.090
G20     210.9          59.2                6.2 +/-    0.61       7.1 +/-    0.61  0.060 / 0.080
G21     274.7          22.6                5.0 +/-    1.70      10.3 +/-    1.70  0.220 / 0.330
G25     233.8          50.2                7.4 +/-    2.61       9.2 +/-    2.61  0.180 / 0.340
G29     333.1          60.0                2.7 +/-    0.35       3.1 +/-    0.35  0.050 / 0.070