PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-10:43:10
G10     250.0          25.7                5.3 +/-    2.15      10.2 +/-    2.15  0.040 / 0.040
G13     54.8           31.0                3.6 +/-    2.06       6.2 +/-    2.06  0.040 / 0.030
G15     85.2           56.6                5.1 +/-    0.93       6.0 +/-    0.93  0.040 / 0.040
G16     297.7          14.9                2.3 +/-    1.22       5.7 +/-    1.22  0.040 / 0.040
G20     37.2           54.8                3.8 +/-    0.92       4.5 +/-    0.92  0.100 / 0.400
G21     335.8          61.2                3.5 +/-    0.43       4.0 +/-    0.43  0.110 / 0.390
G26     268.5          15.8                5.5 +/-    1.99      13.3 +/-    1.99  0.070 / 0.110
G29     163.9          49.2                7.3 +/-    0.47       9.2 +/-    0.47  0.100 / 0.150