PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-14:27:50
G03     203.4          54.5               13.1 +/-    0.70      15.7 +/-    0.70  0.160 / 0.300
G07     259.8          21.4               11.1 +/-    2.78      23.5 +/-    2.78  0.180 / 0.310
G09     310.3          27.8                8.8 +/-    1.97      16.1 +/-    1.97  0.050 / 0.090
G16     102.0          65.3               11.7 +/-    1.38      12.8 +/-    1.38  0.060 / 0.090
G22     184.7          37.3               11.5 +/-    1.45      17.5 +/-    1.45  0.180 / 0.270
G23     331.2          60.9                9.8 +/-    0.58      11.0 +/-    0.58  0.050 / 0.060
G26     54.6           44.8                9.4 +/-    1.06      12.7 +/-    1.06  0.030 / 0.040
G27     135.1          10.5               -0.8 +/-   36.73      -2.2 +/-   36.73  0.040 / 0.040
G31     59.8           10.0                9.2 +/-    3.58      25.6 +/-    3.58  0.200 / 0.290