PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-23:28:10
G02     215.3          60.2               13.9 +/-    1.07      15.8 +/-    1.07  0.070 / 0.080
G06     66.2           78.1               11.2 +/-    0.59      11.4 +/-    0.59  0.060 / 0.060
G12     317.2          32.6               10.0 +/-    1.66      16.6 +/-    1.66  0.070 / 0.100
G17     56.8           32.1                9.5 +/-    2.27      15.9 +/-    2.27  0.050 / 0.100
G19     38.3           49.5               10.9 +/-    1.03      13.9 +/-    1.03  0.140 / 0.220
G24     264.8          41.9               14.2 +/-    2.98      20.1 +/-    2.98  0.120 / 0.250
G28     120.7          18.2               13.8 +/-    2.26      31.8 +/-    2.26  0.030 / 0.030