PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/27-07:57:40
G02     65.6           26.7                2.1 +/-    0.98       3.9 +/-    0.98  0.030 / 0.040
G05     50.9           54.3                4.0 +/-    0.57       4.8 +/-    0.57  0.040 / 0.030
G12     184.8          27.4                4.5 +/-    1.48       8.3 +/-    1.48  0.080 / 0.140
G13     124.1          19.2                6.2 +/-    1.51      13.8 +/-    1.51  0.080 / 0.110
G15     159.3          17.6                4.3 +/-    1.24      10.0 +/-    1.24  0.250 / 0.360
G20     214.9          60.2                5.4 +/-    0.77       6.1 +/-    0.77  0.220 / 0.300
G21     276.8          22.5                4.2 +/-    1.43       8.6 +/-    1.43  0.050 / 0.040
G25     230.1          47.5                5.0 +/-    2.84       6.5 +/-    2.84  0.050 / 0.040
G29     333.4          61.5                3.5 +/-    0.70       3.9 +/-    0.70  0.110 / 0.230