PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-04:28:10
G05     46.2           23.4                1.6 +/-    0.96       3.2 +/-    0.96  0.120 / 0.410
G13     86.9           35.1                4.6 +/-    1.06       7.3 +/-    1.06  0.140 / 0.400
G15     134.5          46.1                7.9 +/-    0.70      10.5 +/-    0.70  0.040 / 0.080
G20     240.6          30.1                5.0 +/-    0.84       8.8 +/-    0.84  0.040 / 0.080
G21     306.3          42.5                5.8 +/-    1.32       8.1 +/-    1.32  0.050 / 0.130
G25     203.4          18.2                5.6 +/-    2.46      12.9 +/-    2.46  0.060 / 0.130
G26     299.4          18.7                5.2 +/-    1.62      11.7 +/-    1.62  0.040 / 0.120
G29     136.5          77.9                5.2 +/-    0.26       5.3 +/-    0.26  0.040 / 0.130