Function: logn(numbers("per") if numbers('rrr') > band pass(numbers("per")) else minus(band pass(numbers("per")), numbers("per")) if minus(band pass(numbers("per")), numbers("per")) > minus(band pass(numbers("per")) if minus(band pass(numbers("per")), numbers("per")) > numbers("per") else numbers('rrr'), minus(band pass(numbers("per")), numbers("per"))) else band pass(numbers("per")))
