PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/18-09:12:30
G02     326.1          80.3                3.5 +/-    0.55       3.6 +/-    0.55  0.220 / 0.370
G05     167.0          29.3                5.5 +/-    1.81       9.7 +/-    1.81  0.150 / 0.370
G06     40.1           45.1                2.1 +/-    0.83       2.8 +/-    0.83  0.020 / 0.030
G12     315.9          67.1                4.6 +/-    0.72       5.0 +/-    0.72  0.030 / 0.030
G17     84.4           11.0                6.1 +/-    2.20      16.6 +/-    2.20  0.070 / 0.130
G19     70.6           30.9                4.3 +/-    1.35       7.5 +/-    1.35  0.080 / 0.110
G24     226.5          23.8                4.8 +/-    2.73       9.6 +/-    2.73  0.040 / 0.050
G25     316.9          31.8                3.3 +/-    1.98       5.6 +/-    1.98  0.050 / 0.040