PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-08:27:50
G02     23.5           64.0                2.3 +/-    0.64       2.5 +/-    0.64  0.030 / 0.040
G05     153.5          50.6                6.7 +/-    0.70       8.4 +/-    0.70  0.020 / 0.040
G06     46.5           29.2                2.8 +/-    1.47       5.0 +/-    1.47  0.160 / 0.180
G12     246.7          78.7                4.4 +/-    0.30       4.4 +/-    0.30  0.290 / 0.270
G19     90.2           16.8                5.5 +/-    1.27      13.2 +/-    1.27  0.030 / 0.020
G20     199.5          10.8               -5.5 +/-    9.11     -15.0 +/-    9.11  0.030 / 0.020
G24     217.5          11.6                2.3 +/-    2.47       6.2 +/-    2.47  0.280 / 0.430
G25     310.8          43.4                3.5 +/-    0.86       4.9 +/-    0.86  0.160 / 0.280
G29     299.4          21.1                2.8 +/-    1.33       5.9 +/-    1.33  0.040 / 0.050