PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-02:58:10
G02     54.9           35.9                4.8 +/-    0.98       7.5 +/-    0.98  0.050 / 0.080
G05     67.5           64.7                5.9 +/-    0.53       6.5 +/-    0.53  0.060 / 0.070
G12     187.8          41.8                7.6 +/-    1.54      10.8 +/-    1.54  0.150 / 0.260
G13     132.0          10.8               -6.2 +/-   17.31     -17.0 +/-   17.31  0.140 / 0.350
G21     267.2          14.8                8.1 +/-    1.86      20.2 +/-    1.86  0.030 / 0.040
G25     245.5          55.8                7.4 +/-    0.74       8.8 +/-    0.74  0.040 / 0.040
G29     328.0          52.7                5.3 +/-    0.64       6.4 +/-    0.64  0.210 / 0.530