PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-11:28:00
G02     36.9           52.4                5.2 +/-    1.21       6.4 +/-    1.21  0.020 / 0.020
G05     136.2          63.6                9.5 +/-    0.47      10.4 +/-    0.47  0.030 / 0.030
G06     53.3           19.5                2.5 +/-    3.09       5.6 +/-    3.09  0.220 / 0.230
G12     200.9          66.8                8.7 +/-    0.51       9.4 +/-    0.51  0.160 / 0.190
G20     199.9          25.9                6.9 +/-    1.60      13.1 +/-    1.60  0.040 / 0.030
G25     293.8          54.7                6.1 +/-    2.08       7.2 +/-    2.08  0.030 / 0.030
G29     310.7          32.8                3.7 +/-    1.14       6.1 +/-    1.14  0.040 / 0.040