PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-15:57:50
G07     320.4          54.3               12.0 +/-    0.73      14.4 +/-    0.73  0.250 / 0.490
G08     121.4          44.2               13.6 +/-    0.64      18.6 +/-    0.64  0.190 / 0.320
G09     284.2          81.4               11.4 +/-    0.67      11.5 +/-    0.67  0.050 / 0.050
G16     42.7           22.4                9.8 +/-    2.33      20.3 +/-    2.33  0.040 / 0.050
G23     148.0          57.9               14.0 +/-    0.46      16.3 +/-    0.46  0.170 / 0.190
G27     74.6           37.5               11.8 +/-    1.41      17.9 +/-    1.41  0.150 / 0.200
G28     226.2          12.5               10.0 +/-    9.70      26.4 +/-    9.70  0.050 / 0.060
G30     290.7          27.0               12.4 +/-    1.28      23.2 +/-    1.28  0.060 / 0.060