PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-22:27:50
G02     201.9          31.5               16.1 +/-    1.20      27.4 +/-    1.20  0.110 / 0.450
G06     168.9          62.9               15.0 +/-    0.62      16.6 +/-    0.62  0.080 / 0.100
G12     304.2          10.2               -8.0 +/-   14.00     -22.3 +/-   14.00  0.070 / 0.080
G17     33.1           51.3               10.9 +/-    0.59      13.5 +/-    0.59  0.050 / 0.120
G19     353.1          67.3               11.2 +/-    0.59      12.0 +/-    0.59  0.050 / 0.120
G24     300.6          36.9               13.3 +/-    0.67      20.4 +/-    0.67  0.040 / 0.040
G28     96.2           37.3               12.5 +/-    0.86      19.0 +/-    0.86  0.030 / 0.040