def tagged_struct_columns(typegraph, struct_id):
    """ Return a dict mapping the struct column names to versions tagged with the id.
    """
    struct_id = str(struct_id)
    typedef = 'Struct' + struct_id
    colheader = ('struct_id', *typegraph.fields[typedef])
    return { header:"t{:s}_{:s}".format(struct_id, header) for header in colheader}