PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-21:12:50
G02     40.1           49.5                9.5 +/-    1.07      12.0 +/-    1.07  0.040 / 0.030
G05     117.0          68.2               11.7 +/-    0.59      12.5 +/-    0.59  0.040 / 0.020
G12     187.1          54.9               12.5 +/-    0.35      14.9 +/-    0.35  0.050 / 0.050
G25     280.0          58.0               16.7 +/-    1.80      19.4 +/-    1.80  0.040 / 0.060
G29     313.0          33.9                9.1 +/-    1.33      14.7 +/-    1.33  0.060 / 0.050