PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-16:27:30
G07     308.6          49.3               12.5 +/-    1.35      15.9 +/-    1.35  0.120 / 0.260
G08     130.5          38.0               12.5 +/-    0.64      18.9 +/-    0.64  0.080 / 0.230
G09     312.6          73.9               11.9 +/-    0.78      12.3 +/-    0.78  0.030 / 0.070
G16     41.9           30.9                9.1 +/-    0.52      15.7 +/-    0.52  0.040 / 0.070
G23     140.5          67.7               12.4 +/-    0.91      13.3 +/-    0.91  0.040 / 0.080
G27     86.4           37.3               11.4 +/-    0.56      17.4 +/-    0.56  0.050 / 0.080
G30     283.7          21.2               10.6 +/-    1.73      22.7 +/-    1.73  0.060 / 0.150