Observed peak frequencies and corresponding peak flux densities of FRB 20200428 (stars) and the spectra of potentially associated X-ray bursts from SGR 1935+2154 observed with Insight-HXMT (green and orange bow ties) and KW (black data points) together with our model analysis results. The gray lines represent the model-predicted spectra of both FRB and associated X-ray bursts derived from 100 randomly selected model parameter sets based on our Monte Carlosimulation analysis and assuming $\chi =\frac{\pi }{4}$. The red, blue, and green lines represent the model fit to the observed spectra of three outbursts of FRB 20200428 together with potentially associated X-ray bursts from SGR 1935+2154.