PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/03/20-07:57:30
G10     252.8          29.5                5.8 +/-    1.66      10.3 +/-    1.66  0.040 / 0.040
G13     51.0           27.7                2.6 +/-    2.35       4.7 +/-    2.35  0.040 / 0.030
G15     79.5           56.2                4.5 +/-    0.66       5.3 +/-    0.66  0.130 / 0.480
G16     298.6          13.6                2.0 +/-    2.08       5.2 +/-    2.08  0.130 / 0.550
G20     273.9          52.7                5.5 +/-    3.04       6.7 +/-    3.04  0.130 / 0.190
G21     343.1          64.1                3.8 +/-    0.81       4.2 +/-    0.81  0.140 / 0.140
G26     269.8          14.2                3.6 +/-    1.42       9.2 +/-    1.42  0.110 / 0.100
G29     161.7          41.4                6.0 +/-    0.73       8.5 +/-    0.73  0.110 / 0.090