def METHOD_NAME(fid):
    """Read filter information."""
    f = dict()
    f["freq"] = _read_double(fid)[0]
    f["class"] = _read_int(fid)
    f["type"] = _read_int(fid)
    f["npar"] = _read_int2(fid)
    f["pars"] = _read_double(fid, f["npar"])
    return f