def _cli_options(parameters):
    """Return command line options for parameters passed as
    AiiDA ArrayData
    """
    arrayname = parameters.get_arraynames()[0]
    dVarray = parameters.get_array(arrayname) # array of volume change in %: -6, -2, ...
    ndV = 0 # number of non-zero volume changes
    options = ''
    for dV in dVarray:
        if dV != 0: # exclude zero volume change
            options += '\n' + str(dV)
            ndV += 1
    if ndV == 0:
        raise # error 0 volume changes
    options = '1\n' + str(ndV) + options # 1 is the uniform (a, b, c) volume change option

    return options