PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/21-04:42:50
G02     323.9          80.9                2.5 +/-    0.47       2.5 +/-    0.47  0.190 / 0.150
G05     166.0          28.9                4.2 +/-    1.60       7.6 +/-    1.60  0.230 / 0.240
G06     38.6           50.3                2.9 +/-    1.10       3.7 +/-    1.10  0.150 / 0.130
G12     317.5          63.6                2.7 +/-    0.86       3.0 +/-    0.86  0.120 / 0.130
G17     82.7           12.4                3.5 +/-    2.83       9.4 +/-    2.83  0.060 / 0.070
G19     69.7           30.7                3.5 +/-    1.73       6.0 +/-    1.73  0.060 / 0.080
G24     229.6          25.4                4.9 +/-    2.53       9.5 +/-    2.53  0.030 / 0.030
G25     317.3          27.1                2.7 +/-    2.52       5.0 +/-    2.52  0.040 / 0.030