Function: product(square(sqrt(band pass(numbers("yxx") if numbers("per") > numbers('xyy') else numbers("yxx") if numbers("yxx") > numbers('xyy') else numbers("yxx")))), sqrt(band pass(numbers("per") if numbers("yxx") > numbers("yxx") else numbers('xyy') if numbers('xyy') > numbers("yxx") else numbers("yxx"))))
