PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-10:27:40
G10     270.7          41.0                5.3 +/-    0.83       7.7 +/-    0.83  0.040 / 0.030
G13     40.3           15.3                2.9 +/-    3.06       7.2 +/-    3.06  0.040 / 0.040
G15     55.6           45.7                3.5 +/-    1.02       4.6 +/-    1.02  0.130 / 0.210
G16     280.8          10.7                4.6 +/-    0.95      12.6 +/-    0.95  0.110 / 0.210
G20     304.5          61.8                4.8 +/-    0.76       5.4 +/-    0.76  0.160 / 0.290
G21     29.3           74.4                5.5 +/-    0.45       5.7 +/-    0.45  0.180 / 0.560
G24     115.5          16.3                6.6 +/-    1.31      16.0 +/-    1.31  0.080 / 0.060
G27     318.3          19.3                3.8 +/-    1.87       8.5 +/-    1.87  0.080 / 0.080
G29     165.8          24.0                6.5 +/-    0.68      13.1 +/-    0.68  0.040 / 0.050