set colorbar scale / limits

Question

I have a plot with an aberrant scale on colorbar compared to the frequency of interest. I would like to change at least the max and min values of the colorbar. How can I do that ? I did not found the parameters in colorbar ?

for ch, ax in enumerate(axes[:-1]):  # for each channel
        # positive clusters
        _, c1, p1, _ = pcluster_test(tfr_ev.data[:, ch], tail=1, **kwargs)
        # negative clusters
        _, c2, p2, _ = pcluster_test(tfr_ev.data[:, ch], tail=-1, **kwargs)

        =2)  # combined clusters
        p = np.concatenate((p1, p2))  # combined p-values
        mask = c[..., p <= 0.05].any(axis=-1)

        # plot TFR (ERDS map with masking)
        tfr_ev.average().plot([ch], cmap="RdBu", 
                              #cnorm=cnorm, 
                              axes=ax,
                              colorbar=False, show=False, mask=mask,
                              mask_style="mask")

        ax.set_title(epochs.ch_names[ch], fontsize=10)
        ax.axvline(0, linewidth=1, color="black", linestyle=":")  # event
        if ch != 0:
            ax.set_ylabel("")
            ax.set_yticklabels("")
    fig.colorbar(axes[0].images[-1], cax=axes[-1]).ax.set_yscale("linear")
    fig.suptitle(f"ERDS ({event})")
    plt.show()

plot_with_aberrant_scale