Results of the MC-SPF fitting for the nucleus region of the Cartwheel galaxy. Upper panel: MUSE spectrum (black) and best-fitting model (dark red). Spectral intervals dominated by bright skylines are not used in the fit. Fit residuals (Data-Model) are shown below the spectrum and the grey shaded area shows the 1σ uncertainties. Lower left panel: photometric data points in black. The dark red lines are the total model including the dust emission, dominating at λ > 5 μm, while the blue (green) lines show the contribution of the stellar continuum and nebular line emission from young (old) stellar populations (Age < > 30 Myr). The open magenta stars show the photometric datapoints from the best fit model. Different lines are 100 random samples of the posterior distribution. Lower middle panel: reconstructed SFH from the fitting procedure. The dark red solid line is the median of the SFH samples. Lower right panel: marginalised likelihood maps for the JumpAge Old and Frac. Old fit parameters. The red lines show the median value for each parameter, while the black contours show the 1, 2, and 3σ confidence intervals.