TY - CPAPER AU - R. Sibson BT - Workshop on Meteorological Operations Systems, 7-11 December 1987 CY - Shinfield Park, Reading DA - 1987 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 1987 SP - 87 EP - 93 T2 - Workshop on Meteorological Operations Systems, 7-11 December 1987 TI - Piecewise-quadratic functions and contouring ER -