def writeconv_kwargs(**kwargs):
    """Unpack keyword arguments related to write-convergence-hist-to-file ."""
    ndisplay = kwargs.get("nDisplay", 10)
    fname = kwargs.get("HistFName", "history.dat")
    nmax = kwargs.get("nMax", None)
    state = kwargs.get("State", None)
    crit = kwargs.get("ConvCriteria", 0.01)
    stime = kwargs.get("SimTime", None)
    var_dict = {
        "nDisplay": ndisplay,
        "FileName": fname,
        "nMax": nmax,
        "State": state,
        "ConvCriteria": crit,
        "SimTime": stime
        }
    return var_dict