def load_mapping(key_columns=[], value_modifiers=[], time_columns=[],
    frequency=None, value_label_columns=[], time_tuples=[]):
    """
    Describes how the tabular data should load into lines.
    Modified in the Datavore client.
    """
    return {'keyColumns': key_columns, 'valueModifiers': value_modifiers,
        'timeColumns': time_columns, 'frequency': frequency,
        'valueLabelColumn': value_label_columns, 'timeTuples': time_tuples}
