TY - RPRT AU - C. Temperton CY - Shinfield Park, Reading DA - 07/1977 LA - eng M1 - 12 M3 - Internal Report PB - ECMWF PP - Shinfield Park, Reading PY - 1977 EP - 39 TI - Normal modes of a barotropic version of the ECMWF grid-point models ER -