PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-06:28:10
G10     270.1          40.8                5.7 +/-    1.99       8.1 +/-    1.99  0.070 / 0.070
G13     40.5           15.6                2.7 +/-    3.61       6.6 +/-    3.61  0.060 / 0.080
G15     55.8           45.6                2.9 +/-    0.64       3.9 +/-    0.64  0.040 / 0.040
G16     280.7          11.1                4.0 +/-    3.73      10.9 +/-    3.73  0.040 / 0.040
G20     303.2          61.5                2.7 +/-    0.77       3.0 +/-    0.77  0.110 / 0.210
G21     16.3           73.7                3.7 +/-    1.02       3.9 +/-    1.02  0.120 / 0.250
G24     117.4          15.8                5.4 +/-    1.12      13.2 +/-    1.12  0.170 / 0.460
G27     318.3          19.4                3.8 +/-    1.87       8.5 +/-    1.87  0.170 / 0.520
G29     165.6          24.7                3.0 +/-    1.41       5.9 +/-    1.41  0.120 / 0.160