def plot_resolution_vs_qualityscore(structures):
    """
    Plot resolution versus the KLIFS quality score.

    Parameters
    ----------
    structures : pandas.DataFrame
        Structures DataFrame from opencadd.databases.klifs module.

    Returns
    -------
    matplotlib.pyplot.axis
        Plot axis.
    """
    ax = structures.plot(
        x="structure.resolution",
        y="structure.qualityscore",
        kind="scatter",
        figsize=(4, 4),
        title="Resolution vs. quality score",
        s=2,
        alpha=0.2,
    )
    ax.set_xlabel("Resolution in $\AA$")
    ax.set_ylabel("KLIFS quality score")
    return ax