PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/03/21-07:27:50
G10     243.3          21.2                6.5 +/-    2.95      13.8 +/-    2.95  0.040 / 0.040
G13     62.4           33.4                4.4 +/-    1.73       7.2 +/-    1.73  0.040 / 0.040
G15     103.2          57.0                6.3 +/-    0.78       7.4 +/-    0.78  0.050 / 0.100
G16     309.6          12.5                2.5 +/-    1.83       6.6 +/-    1.83  0.060 / 0.100
G20     259.0          45.0                7.2 +/-    3.09       9.7 +/-    3.09  0.210 / 0.230
G21     327.7          56.3                4.5 +/-    0.54       5.3 +/-    0.54  0.140 / 0.160
G26     281.0          17.6                4.2 +/-    0.82       9.8 +/-    0.82  0.130 / 0.250
G29     157.1          54.2                7.0 +/-    0.36       8.4 +/-    0.36  0.160 / 0.300