PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-06:58:00
G10     286.2          48.4                3.0 +/-    0.60       3.9 +/-    0.60  0.040 / 0.050
G15     48.0           34.5                1.7 +/-    0.79       2.7 +/-    0.79  0.040 / 0.050
G20     332.3          65.0                1.8 +/-    1.00       2.0 +/-    1.00  0.050 / 0.040
G21     68.2           76.1                4.2 +/-    0.91       4.3 +/-    0.91  0.040 / 0.040
G24     105.4          22.8                5.3 +/-    1.86      11.0 +/-    1.86  0.090 / 0.120
G27     310.0          28.6                2.9 +/-    1.18       5.2 +/-    1.18  0.080 / 0.120
G29     166.2          12.0                2.4 +/-    2.04       6.4 +/-    2.04  0.090 / 0.180
G32     208.4          19.1                3.6 +/-    3.53       8.2 +/-    3.53  0.090 / 0.200