PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-19:12:30
G03     221.7          65.0                9.6 +/-    1.74      10.5 +/-    1.74  0.040 / 0.040
G09     305.1          19.8               10.7 +/-    1.35      23.6 +/-    1.35  0.040 / 0.050
G14     102.3          13.4               11.7 +/-    2.15      30.3 +/-    2.15  0.130 / 0.250
G16     120.8          61.6               14.7 +/-    0.80      16.5 +/-    0.80  0.140 / 0.330
G22     191.0          50.7               11.8 +/-    1.00      14.8 +/-    1.00  0.050 / 0.060
G23     323.4          53.3               12.1 +/-    0.82      14.7 +/-    0.82  0.040 / 0.060
G26     63.4           49.4               10.2 +/-    0.83      13.0 +/-    0.83  0.160 / 0.450
G31     54.3           16.3                8.7 +/-    2.20      21.0 +/-    2.20  0.150 / 0.610