def get_type_for_extra_dim(type_index):
try:<EOL><INDENT>return _extra_dims_style_1[type_index]<EOL><DEDENT>except IndexError:<EOL><INDENT>raise errors.UnknownExtraType(type_index)<EOL><DEDENT>
Returns the type str ('u1" or "u2", etc) for the given type index
    Parameters
    ----------
    type_index: int
        index of the type as defined in the LAS Specification

    Returns
    -------
    str,
        a string representing the type, can be understood by numpy