Comparison of the metal mass M_z and metal-mass fraction M_z/M between the observed transiting giant planets and the results of our simulations. Gray circles indicate the estimates by Thorngren et al. (2016), which were fitted by power-law distributions (dashed lines). HD 149026b and TOI-849b are plotted with purple and brown symbols, respectively. The simulation results are plotted with cresses and circles. The pebble flux was varied, and five runs were performed for each pebble flux. (a) Without PEW, (b) with PEW.