PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-13:27:50
G10     267.5          38.0                5.3 +/-    1.56       8.0 +/-    1.56  0.130 / 0.270
G13     42.0           18.7                3.8 +/-    2.46       8.7 +/-    2.46  0.270 / 0.240
G15     57.4           46.8                4.9 +/-    0.70       6.5 +/-    0.70  0.040 / 0.080
G16     281.0          11.3                4.6 +/-    1.87      12.4 +/-    1.87  0.050 / 0.070
G18     307.7          66.0                5.4 +/-    0.74       5.9 +/-    0.74  0.040 / 0.040
G20     52.6           38.4                3.7 +/-    1.02       5.5 +/-    1.02  0.030 / 0.040
G21     16.0           73.5                4.9 +/-    0.88       5.1 +/-    0.88  0.160 / 0.250
G24     120.7          14.4                6.3 +/-    3.08      15.9 +/-    3.08  0.160 / 0.250
G27     317.8          20.3                3.4 +/-    2.56       7.3 +/-    2.56  0.230 / 0.510
G29     166.9          28.0                6.7 +/-    1.10      12.3 +/-    1.10  0.220 / 0.410